巧算0.39×0.21
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巧算0.39×0.21巧算0.39×0.21巧算0.39×0.210.39×0.21=(0.4-0.01)×(0.2+0.01)=0.08+0.004-0.002-0.0001=0.0819
巧算0.39×0.21
巧算0.39×0.21
巧算0.39×0.21
0.39×0.21
=(0.4-0.01)×(0.2+0.01)
=0.08+0.004-0.002-0.0001
=0.0819
巧算0.39×0.21
(1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)巧算?写清思路
巧算（1/110*2.1*0.54*55）/54*0.21*4又1/2
巧算!
巧算,
巧算(2-1/2)×(2-2/3)×(2-3/4)×……×(2-2002/2003)巧算：(2-1/2)×(2-2/3)×(2-3/4)×……×(2-2002/2003)（1+0.228-0.21）*（0.228-0.21+0.20030)-(1+0.228-0.21+0.2003）*（0.228-0.21）解方程：7（x-3)=9+X21-x=1.5(9+x)
5.1+0.39
6.5*0.21
0.39*102 (简便计算)
0.39*2.9=?竖式
5.6÷0.39
7、巧算?
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巧算?…
巧算,(写纸上)
(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)要怎么简算,
计算(1+0.21+0.32)x(0.21+0.32+0.43)-(1+0.21+0.32+0.43)x(0.21+0.2)
计算(1+0.21+0.32)x(0.21+0.32+0.43)-(1+0.21+0.32+0.43)x(0.21+0.2)