1樓:昌昌無敵
解:來1、3.7+0.3-2.8-1.2
=(自3.7+0.3)-(2.8+1.2).
=4-4=0
2、(5又2/5+8)÷[(1.15+13/20)×1又2/3]=(27/5+40/5)÷【(23/20+13/20)×5/3】=67/5÷(9/5×5/3)
=67/5÷3
=67/15
3、2356÷2356又2356/2357望採納
簡便計算;12.8÷2分之1×2分之1÷0.72【6分之5+12分之7+8分之3】÷48分之13【1-4分之3】÷0.25×4 5
2樓:新野旁觀者
12.8÷2分之1×2分之1÷0.7
=(2.8÷0.7)×(1/2÷1/2)
=4×1
=42【6分之5+12分之7+8分之3】÷48分之1=【5/6+7/12+3/8】×48
=5/6×48+7/12×48+3/8×48=40+28+18
=863【1-4分之3】÷0.25×4
=1/4×4÷0.25
=1÷0.25
=443.6÷【1.4÷7】-9
=3.6÷0.2-9
=18-9
=954分之5×4.8÷【3分之11÷3分之5+0.2】=6÷【2.2+0.2】
=6÷2.4
=2.5
6【1-(2分之1+3分之1)×5分之1】÷6分之5=【1-5/6×1/5】÷5/6
=【1-1/6】÷5/6
=5/6÷5/6
=18【1-(四分之1+8分之3)】÷4分之1=【1-5/8】÷1/4
=3/8÷1/4
=1.5
簡便運算 1 7/25×101-7/25 2(5/6+7/8-5/12)÷1/2 3 75%×3/7+1/7×3/4+3/7×0.75 = = =
3樓:妖精
1 7/25×101-7/25
=7/25×(101-1)
=7/25×100
=282(5/6+7/8-5/12)÷1/2=(5/6+7/8-5/12)×2
=5/6×2+7/8×2-5/12×2
=5/3-5/6+7/4
=5/6+7/4
=10/12+21/12
=31/12
3 75%×3/7+1/7×3/4+3/7×0.75=0.75×(3/7+1/7+3/7)
=0.75×1
=0.75
不懂可追問,有幫助請採納,謝謝!
4樓:燕北風情
1 7/25×
101-7/25=7/25×(100+1)-7/25=28+7/25-7/25
=282(5/6+7/8-5/12)÷1/2=(5/6+7/8-5/12)x2
=5/3+7/4-5/6
=5/6+7/4
=10/12+21/12
=31/12
3 75%×3/7+1/7×3/4+3/7×0.75=3/4x3/7+1/7x3/4+3/7x3/4
=3/4x(3/7+1/7+3/7)
=3/4x1
=3/4
願你學習進步
5樓:匿名使用者
都是結合律和分配率的應用吧
1又2/3×[7又5/6+(4.125-4又1/8)-4又5/6] [(2/3+1/4)]×3/4]÷5/8 能簡便就簡便 晚上就要啊。。急急急
6樓:匿名使用者
1又2/3×[7又5/6+(4.125-4又1/8)-4又5/6] [(2/3+1/4)]×3/4]÷5/8
=5/3 *【7又5/6+0-4又5/6] [(2/3+1/4)]×3/4]*8/5
=(5/3 * 8/5)【7又5/6+0-4又5/6] [(2/3+1/4)]×3/4]
=8/3*【3(2/3+1/4)×3/4】
=8/3 *3(2/3+1/4)×3/4
=(8*3/4)(2/3+1/4)
=6(2/3+1/4)
=4+ 3/2
=5又1/2
(2.25÷0.375×1/6-0.3×2又2/3)×(2.3×0.25+0.27×2.5)
=(9/4 * 8/3 *1/6 -0.3* 8/3)*( 2.3*0.25 +2.7* 0.25)
=(1-0.8)*(2.3+2.7)*0.25
=0.2*5*0.25
=0.25
(7/10+1/2)÷3/8-1/5,8/45×5/8+3/7÷9/28,3/10÷(2/5+4/15)-1/5,簡便計算,跪求
7樓:匿名使用者
(7/10+1/2)÷3/8-1/5
=(7/10+1/2)×8/3-1/5
=7/10×8/3+1/2×8/3-1/5=28/15+4/3-1/5
=28/15+20/15-3/15
=45/15
=38/45×5/8+3/7÷9/28
=8/45×5/8+3/7×28/9
=1/9+4/3 分數乘法可以約簡
=1/9+12/9
=13/9
3/10÷(2/5+4/15)-1/5
=3/10÷(6/15+4/15)-1/5 括號前是除法的,只能先算括號內的。
=3/10÷10/15-1/5
=3/10×15/10-1/5
=45/100-20/100
=25/100
=1/4
8樓:雅麗兔
(7/10+1/2)÷3/8-1/5
=(7/10+1/2)×8/3-1/5
=7/10×8/3+1/2×8/3-1/5=28/15+12/15-3/15
=36/15
9樓:水天堂莫莫
通分後相互之間消去公約數,就很簡單啊
能簡便的就簡便計算 5/7+5/6+2/7+1/6= 1/15*(1/3+1/12) 1/4/(3-5/13-8/13) 4/9/【5/6-(1/6+1/3)】
10樓:匿名使用者
5/7+5/6+2/7+1/6=(5/7+2/7)+(5/6+1/6)=1+1=2
1/15*(1/3+1/12)=1/15(4/12+1/12)=1/15*5/12=1/36
1/4/(3-5/13-8/13)=1/4/(3-1)=1/4/2=1/8
4/9/【5/6-(1/6+1/3)】=4/9/(5/6-1/6-1/3)=4/9/(4/6-1/3)=4/9/(1/3)=4/3
其實你應當自己做,不會就應努力學,不學永遠不會。
11樓:surfer男孩
5/7+5/6+2/7+1/6= 5/7+2/7+5/6+1/6=1+1=2
1/15*(1/3+1/12) =1/15*(4/12+1/12)=1/15*5/12=1/36
1/4/(3-5/13-8/13)=1/4/[3-(5/13+8+13)]=1/4/[3-1]=1/8
4/9/【5/6-(1/6+1/3)】=4/9[5/6-1/6-1/3]=4/9/1/3=4/3
能簡便的必須得簡便。
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