1樓:慄鎖
(bai1)10.15-10.75×
du0.4-5.7,
zhi=10.15-4.3-5.7,
=10.15-(dao4.3+5.7),
=10.15-10,
=0.15;
(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,
=(5.8+4.2)×專3.74,
=10×3.74,
=37.4;
(3)32.52-(6+9.728)÷屬3.2×2.5,=32.52-15.728÷3.2×2.5,=32.52-4.915×2.5,
=32.52-12.2875,
=20.2325;
(4)[(7.1-5.6)×0.9-1.15]÷2.5,=[1.5×0.9-1.15]÷2.5,
=[1.35-1.15]÷2.5,
=0.2÷2.5,
=0.08;
(5)5.4÷[2.6×(3.7-2.9)+0.62],=5.4÷[2.6×0.8+0.62],
=5.4÷[2.08+0.62],
=5.4÷2.7,
=2;(6)[20-(90.75÷6.6+2.25)]×11.6,=[20-(13.75+2.25)]×11.6,=[20-16]×11.6,
=4×11.6,
=46.4.
計算下面各題.能簡便的用簡便方法計算4.05÷0.5+10.7521.6÷0.8-1.2×56.8×2.7+2.7×3.28.4×6.9÷(6.
2樓:手機使用者
(1)4.05÷0.5+10.75
=8.1+10.75
=18.85
(2)21.6÷0.8-1.2×5
=27-6
=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7
=10×2.7
=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3
=8.4×(6.9÷2.3)
=8.4×3
=25.2
(5)0.38×102
=0.38×(100+2)
=0.38×100+0.38×2
=38+0.76
=38.76
(6)4.8÷2.5÷4
=4.8÷(2.5×4)
=4.8÷10
=0.48
計算下面各題(能簡便的用簡便方法) 8/9+7/12+3/4 5/12+7/8-9/20 2.85+2/7+2.15+4/7 3.4-(0.25+2/5)
3樓:新野旁觀者
8/9+7/12+3/4
=32/36+21/36+27/36
=80/36
=20/9
=2又2/9
5/12+7/8-9/20
=50/120+105/120-54/120=101/120
2.85+2/7+2.15+4/7
=(2.85+2.15)+2/7+4/7
=5+6/7
=5又6/7
3.4-(0.25+2/5)
=3.4-0.4-0.25
=3-0.25
=2.75
7/8-7/27-20/27
=7/8-(7/27+20/27)
=7/8-1
=-1/8
2.15-(5/6-1/12)
=2.15-3/4
=2.15-0.75
=1.4
11/12+5/8+3/8+1/12
=(11/12+1/12)+(5/8+3/8)=1+1
=25-3/7-4/7
=5-(3/7+4/7)
=5-1
=42/5*20+3/5*20
=(2+3)/5*20
=5/5*20
=205/6-1/4+1/3
=10/12-3/12+4/12
=11/12
4樓:匿名使用者
我是無奈下發的:我是一個叫冰楓的男孩,前
計算下面各題.(能簡便的要用簡便方法計算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0
5樓:手機使用者
(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3
=2.3+1.7
=4(2)21.6÷[64.8-(48.
6-2.7×2)]=21.6÷[64.
8-(48.6-5.4)]=21.
6÷[64.8-43.2]
=21.6÷21.6
=1(3)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
0.13×3.89+0.13×5.11
=0.13×(3.89+5.11)
=0.13×9
=1.17
(5)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
計算下面各題,能用簡便演算法的要用簡便法計算. (1)0.25×8.75×4 (2)25.8×7+3×25.8
6樓:澤速浪
(1)0.25×du8.75×4,
=0.25×zhi4×8.75,dao
=100×8.75,
=875;
(回2)25.8×7+3×25.8,
=25.8×(7+3),
=25.8×10,
=258;
(3)10÷答0.2÷2.5,
=10÷(0.2×2.5),
=10÷0.5,
=20;
(4)21.36÷0.8-12.9,
=26.7-12.9,
=13.8.
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11 12 5 8 3 8 1 12 5 3 7 4 7 2 5 20 3 5 20 5 6 1 40.25 2 5 3.4 0.4 0.25 3 0.25 2.75 7 8 7 27 20 計算下面各題，能簡便計算的用簡便方法計算 2 6 13 9 26 1 3 1 4 36 6 7 4 5 2 ...