8.4*7.2+0.84*28简便计算(递等式)
8.4*7.2+0.84*28简便计算(递等式)
8.4*7.2+0.84*28
=0.84*72+0.84*28
=0.84*(72+28)
=0.84*100
=84
7.2×63+28×6.3简便递等式计算
解: 7.2×63+28×6.3
=7.2×63+2.8×63
=(7.2+2.8)×63
=10×63
=630
638×64-28×319递等式计算 简便计算
- 先分析,638=319×2,所以可以拆分
-
638×64-28×319
=(319×2×64)-(28×319)
=319×(2×64-28)
=319×(128-28)
=319×100
=31900
60.72×8.9-7.2×0.11怎么简便计算递等式?
60.72×8.9-7.2×0.11
=8x7.59x8.9-8x0.9x0.11
=8x(7.59x8.9-0.9x0.11)
=8x(67.551-0.099)
=8x67.452
=539.616
28+52×2-80 简便计算 递等式
28 + 52×2 - 80
= 52×2 - 52
= 52
递等式计算。(能简便计算的要简便计算):(1)1.4×9.7+97×0.86(2)8.4÷0.8÷0.125÷4.2
(1)1.4×9.7+97×0.86
=9.7×(1.4+8.6)
=9.7×10
=97;
(2)8.4÷0.8÷0.125÷4.2
=8.4÷4.2÷(0.8×0.125)
=2÷0.1
=20;
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4.2×102简便计算,递等式
=4.2×(100+2)
=4.2×100+4.2×2
=420+8.4
=428.4
86*102简便计算 递等式
86*102
=86*(100+2)
=86*100+86*2
=8600+172
=8772
简便计算递等式:1400÷25
1400÷25
=(1400×4)÷(25×4)
=5600÷100
=56
或者
1400÷25
=14×(100÷25)
=14×4
=56
101*15的递等式简便计算
101×15
=(100+1)×15
=100×15+1×15
=1500+15
=1515