360 480 120 100怎樣簡便計算

2023-02-03 21:21:03 字數 6289 閱讀 1959

1樓:生活助手小薛

75+360÷(20-5) 簡單計算吐:=75+360÷(20-5)=75+360÷15=75+360÷3÷5=75+120÷5=75+24=99擴充套件data 簡單計算方法: 1.

補舍入法 對於接近整數

十、一百……的數字,將其轉換為

十、一百……,加減一個數,即可進行計算簡單的。例如:536-198=536_(200_2)=536_200+2=33844x101=44x(100+1)=44x100+44=44442,分解法。

在一些乘法和除法運算中,可以將其中一個數分解,以使計算更容易。例如:25x1.

25x32=25x1.25x(4x8)=(25x4)x(1.25x8)=100x10=1000560÷35=560÷7÷5=80÷5=163,部分基準數接近a某數相加,可以用某一個數作為參考數,然後將參考數乘以相加的數,再將每個數與參考數的差相加即可得到計算結果。

例如:81+85+82+78+79=80x5+(1+5+2-2-1)=400+5=405

2樓:匿名使用者

四年級下冊數學簡便計算題

92+99 197+102 354-108

=92+(100-1) =197+(100+2) =354-(100+8)

=92+100-1 =197+100+2 =354-100-8

=191 =299 =246

405-99 127-98 323+189-123

=405-(100-1) =127-(100-2) =323-123+189

= 405-100+1 =127-100+2 =389

=306 =29

545-167-145 478-47-178 344-(144+37)

=545-145-167 =478-178-47 =344-144-37

=233 =253 =163

236-(177+36) 400-256-44 517-53-47

=236-36-177 =400-(256+44) =517-(53+47)

=23 =100 =417

248+86-48 672-36+64 (6467-832)+(1832-1467)

=248-48+86 =672-(36+64) =6467-1467+(1832-832)

= 286 =572 =6000

1530+(592-530)-192 (2+4+6+……+98+100)-(1+3+5+……+97+99)

=1530-530+(592-192) =(2-1)+(4-3)+…+(98-97)+(100-99)

=1400 =1+1+...+1+1 =50

25×9×4 45×4×5 23 ×5×2

=25×4×9 =45×(4×5) =23×(5×2)

=900 =90 =230

8×(125×13) (250×125)×(4×8)

=8×125×13 =125×8×(250×4)

=13000 =1000000

42×125×8×5 25×4×88×125

=125×8×(42×5) =100×11×(8×125)

=210000 =1100000

72×125 125×64×25 42×125×8×5

=8×125×9 =125×8×(25×8) =42×5×(125×8)

=9000 =200000 = 210000

25×4×88×125 88×125

=100×(8×125) ×11 =8×125×11

=100×1000×11 =1000×11

=100000×11 =11000

=1100000

(12+50)×40 125×(40-4) 76×103

=12×40+50×40 =125×40-125×4 =76×(100+3)

=880 =5400 =76×100+76×3

=880 =5400 =76×100+76×3

=7828

18×125 25×44 42×25

=(10+8)×125 =25×4×11 =2×25×21

=10×125+8×125=2250 =110 =1050

99×78 99×9

=(100-1) ×78 =(100-1)×9

=100×78-1×78 =100×9-9×1

=7800-78 =900-9

=7722 =891

45×37+37×55 28×21+28×79 17×23-23×7

=37×+(45+55) =28×(21+79) =23×(17-7)

=3700 =2800 =230

38×46+64×38 99×32+32 46+46×59

=38×(46+64) =32×(99+1) = 46×(59+1)

=38×110 =3200 =2760

=38×(100+10)

=38×100+38×10

=4180

167×2+167×3+167×5 39×8+6×39-39×4

=167×(2+3+5) =39×(8+6-4)

=1670 =390

28×225-2×225-6×225 (42+25)×125+(18+15)×125

=225×(28-2-6) =125×(42+18+25+15)

=4500 =12500

23×2×4+25×4×2+27×1×8+25×8×1 99×22+33×34

=8×(23+25+27) =33×(66+34)

=600 =3300

(12+50)×40 125×(40-4) 86×103

=12×40+50×40 =125×40-125×4 =86×(100+3)

=680 =4500 =86×100+86×3

=8858

18×125 25×44 42×25

=(10+8) ×125 =25×4×11 =2×25×21

=125×10+125×8 =1100 =1050

=2250

99×9 99×78 45×38+38×55

=(100-1) ×9 =(100-1) ×78 =(45+55) ×38

=100×9-9 =78×100-78 =3800

=91 =7722

28×21+28×79 37×23-23×7 38×46+64×38

=(21+79) ×79 =(37-7) ×23 =(46+64) ×38

=7900 =690 =3800

99×32+32 46+46×59 167×2+167×3+167×5

=(99+1) ×32 =(59+1) ×59 =(2+3+5) ×167

=3200 =3540 =1670

39×8+6×39-39×4 28×225-2×225-6×225

=(8+6-4) ×39 =(28-2-6) ×225

=390 =2500

(42+25)×125+(18+15)×125 2005×20062006-2006×20052005

=[(42+18)+(25+15)] ×125 =2005×2006×10001-2006×2005×10001

=12500 =0

360÷4÷9 250÷5÷2 600÷12÷5

=360÷(4×9) = 250÷(5×2) =600÷(12×5)

=10 =25 =10

800÷5÷8 480÷5÷48 240÷5÷12

=800÷8÷5 =480÷48÷5 =240÷12÷5

=20 =2 =4

420÷35 2400÷25 7800÷12

=420÷7÷5 =2400÷5÷5 =7800÷6÷2

=12 =96 =650

960×46÷48 99000÷121×11 3702×38÷1234

=960÷48×46 =99000÷(121÷11) =1234×3×38÷1234

=920 =9000 =114

640÷(16÷4) 1000÷(125÷4)

=640÷16×4 =1000÷125×4

=160 =32

250÷5÷2 600÷12÷5 800÷5÷8 480÷5÷48

=250÷(5×2) =600÷(12×5) =800÷8÷5 =480÷48÷5

=25 =10 =20 = 2

240÷5÷12 420÷35 117+392+608 88×27+27×12

=240÷12÷5 =420÷7÷5 =117+(392+608) =(88+12) ×27

=4 =12 =1117 =270

45×4×5 23 ×5×2

=45×(4×5) =23×(5×2)

=90 =230

25×9×4 8×(125×13) (250×125)×(4×8)

=25×4×9 =8×125×13 =250×4×(125×8)

=900 =13000 =1000000

88×125 72×125 125×64×25

=11×(8×125) =9×(8×125) =125×8×(8×25)

=11000 =9000 =100000

42×125×8×5 25×4×88×125 (12+50)×40

=42×5×(8×125) =100×11×(8×125) =12×40+50×40

=210000 =1100000 =2480

125×(40-4) 76×103 18×125

=125×40-125×4 =76×(100+3) =(10+8) ×125

=4500 =76×100+3×76 =10×125+8×125

=7828 =2250

25×44 42×25 99×9 99×78

=25×(40+4) =(40+2) ×25 =(100-1) ×9 =(100-1) ×78

=25×40+25×4 =40×25+2×25 =9×100-9 =7800-78

=1100 =1050 =891 =7722

45×37+37×55 28×21+28×79 17×23-23×7

=(45+55) ×37 =(21+79) ×79 =(17-7) ×23

=3700 =7900 =230

38×46+64×38 99×32+32 46+46×59

=(46+64) ×38 =(99+1) ×32 =(59+1) ×46

=110×38 =3200 =2760

=(10+100) ×38

=38×10+38×100

=4180

167×2+167×3+167×5 39×8+6×39-39×4 360÷4÷9

=(2+3+5) ×167 =(8+6-4) ×39 =360÷(4×9)

=1670 =390 =10

117+392+608 88×27+27×12

=117+(392+608) =(88+12) ×27

=1117 =2700

88×27+27×12 125×64+125×36

=(88+12) ×27 =(64+36) ×125

=2700 =12500

64×199+64

=64×(199+1)

=12800

87×53+87×47 7×75-7×25 167×25+32×25+25

=(53+47) ×87 =(75-25) ×7 =(167+32+1) ×25

=8700 =350 =5000

38×99+38 147+147×99 25×(4+8)

=(99+1) ×38 =(99+1) ×147 =25×4+8×25

=3800 =14700 =300

108×75 35×201 75×98

=(100+8) ×75 =35×(200+1) =75×(100-2)

=8100 =7035 =7350

25×7×4 2×125×8×6 25×32×125

=25×4×7 =2×6×(125×8) =25×4×(8×125)

=700 =12000 =100000

125×88 25×48 3500÷4÷25

=25×8×11 =25×8×6 =3500÷(4×25)

=11000 =600 =35

420÷35÷2 2.1 × 99 + 2.1

=420÷(35×2) =2.1×(99+1)

=60 =210

4800÷25 (13×8×5×6)÷(4×5×6)

=48×100÷25 =13×(8÷4) ×(5÷5) ×(6÷6)

=48×4 =26

=192

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