1樓:
簡便方法計算
(8+0.7)×12.5+0.7×37.5=8.7×12.5+0.7×3×12.5
=8.7×12.5+2.1×12.5
=10.8×12.5
=10×12.5+0.8×12.5
=125+10
=135
2樓:匿名使用者
(8+0.7)×12.5+0.
7×37.5=8×12.5+0.
7×12.5+0.7×37.
5=100+0.7×(12.5+37.
5)=100+0.7×50
=135
3樓:匿名使用者
解:(8+0.7)×
12.5+0.7×37.5
=8×12.5+0.7×12.
5+0.7×37.5=8×12.
5+0.7×12.5+2.
1×12.5=(8+0.7+2.
1)×12.5
=10.8×12.5
=(10+0.8)×12.5
=10×12.5+0.8×12.5
=125+10
=135
遞等式計算(能簡便的用簡便方法).12.5×(0.7×0.8)70.8-0.8×0.513-3.79+6
4樓:百度使用者
(1)12.5×(0.7×0.8),
=12.5×0.8×0.7,
=10×0.7,
=7;(2)70.8-0.8×0.5,
=70.8-0.4,
=70.4;
(3)13-3.79+6.21,
=9.21+6.21,
=15.42;
(4)12.5×(40+0.7),
=12.5×8×5+12.5×0.7,
=500+8.75,
=508.75;
(5)4.12-1.78-1.22,
=4.12-(1.78+1.22),
=4.12-3,
=1.12;
(6)4.2÷0.7÷6,
=4.2÷(0.7×6),
=4.2÷4.2,=1.
12.5乘7.8乘0.8用簡便方法算
5樓:南方飛虹
=12.5×0.8×7.8
=10×7.8
=78如果我的回答能夠解決你的問題,希望你能夠採納我,如果有疑問繼續追問,衷心感謝你的支援
6樓:瑩星
12.5×7.8×0.8
=12.5×0.8×7.8
=10×7.8=78
用簡便方法計算下面的題:12.5✘8.7,2.5✘4.4-2.5✘0.4,5.24+5.24✘99
7樓:匿名使用者
(1)12.5×8.7 (根據125×8=1000)=12.5×(8+0.8-0.1)
=100+10-1.25
=109.75
(2)2.5×4.4-2.5×0.4 (逆用乘法分配律)=2.5×(4.4-0.4)
=2.5×4
=10(3)5.24+5.24×99 (逆用乘法分配律)=5.24×(1+99)
=5.24×100
=524
8樓:匿名使用者
12.5×8.7
=12.5×(8+0.8-0.1〉
=12.5×8+12.5×0.8-12.5×0.1=100+10-1.25
=108.75
9樓:邊然
12.5x8.7
=12.5ⅹ8+12.5x0.7
=100+8.75
=108.75
2.5x4.4-2.5x0.4
=2.5x(4.4-0.4)
=2.5x4
=105.24+5.24x99
=5.24x(1+99)
=5.24x100
=524
10樓:慢慢慢消磨
12.5x8.7=12.5x(8+0.8-0.1)=12.5x8+12.5x0.8-12.5x0.1=108.75
2.5x4.4-2.5x0.4=2.5x(4.4-0.4)=10
5.24+5.24x99=5.24x(1+99)=524
11樓:匿名使用者
解,12.5x8.7
=12.5x(8+0.8-0.1)
=12.5x8+12.5x0.8-12.5x0.1=100+10-1.25
=108.75
2.5x4.4-2.5x0.4
=2.5x(4.4-0.4)
=2.5x4
=105.24+5.24x99
=5.24x(1+99)
=5.24x100
=524
計算下面各題,能簡算的用簡便方法計算。 18.9×9.9 12.5×8.94×0.8 7.4×0.5+7
12樓:l鮁
18.9×9.9
=18.9×(
10-0.1)
=189-1.89
=187.11
12.5×8.94×0.8
=(12.5×0.8)×8.94
=10×8.94
=89.4
7.4×0.5+7.4÷0.5
=7.4×(0.5+2)
=7.4×2.5
=18.5
4.92÷2.4
=2.05
6.8×32+32×3.2
=32×(6.8+3.2)
=320
(8.1-5.6)÷0.8+7.75
=2.5÷0.8+7.75
=10.875
5.92×2.5
=14.8
5.6×(12.5-8.5÷0.85)
=5.6×2.5
=5.6÷0.4
=143.5×[13-(3.12+5.28)]=3.5×(13-8.4)
=3.5×4.6
=16.1
用簡便方法計算0.8×99+99,12.7+12.5÷5,0.175÷0.25×0.4?
13樓:八戒你胖咯
0.8×99+99
=0.8×(100-1)+99
=80-0.8+99
=178.2
12.7+12.5÷5
=12.7+2.5
=15.2
0.175÷0.25×0.4
=0.7×0.4
=0.28
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