3.6×1994.4+2006.9×6.4要巧算

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3.6×1994.4+2006.9×6.4要巧算
3.6×1994.4+2006.9×6.4
要巧算

3.6×1994.4+2006.9×6.4要巧算
3.6×1994.4+2006.9×6.4
=3.6×1994.4+(1994.4+12.5)×6.4
=3.6×1994.4+1994.4×6.4+12.5×6.4
=1994.4×（3.6+6.4）+12.5×8×0.8
=19944+80
=20024

=10*1994.4-6.4*1994.4+2006.9*6.4
=19944+6.4*(2006.9-1994.4)
=19944+6.4*12.5
=19944+6.4*100÷8
=19944+80
=20024

3.6×1994.4+2006.9×6.4要巧算 1994.4×3.6+2006.9×6.4简算简算3.6*1994 2/5+2006.9*6 2/5RT过程都要有的哈! 3.6x1994又五分之二,加2006.9乘六又五分之二. 8.6X-7.2+3.6=6.急, 3.6. 将-15.-12.-9.-6.-3.0.3.6.9填入9宫图中用-18.-15.-12.-9.-6.-3.0.3.6怎样拼成一个三阶幻方 6... 6. 6. 6. 6. 6. 6. 6. 6. 3.6+3.6*(3.6-3.6/3.6)/3.6如何简算