1.2乘9.9乘2.5的怎么简便运算

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1.2乘9.9乘2.5的怎么简便运算
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1.2乘9.9乘2.5的怎么简便运算
1.2乘9.9乘2.5的怎么简便运算

1.2乘9.9乘2.5的怎么简便运算
1.2*9.9*2.5
=0.3*4*2.5*9.9
=0.3*(4*2.5)*9.9
=0.3*10*9.9
=3*(10-0.1)
=30-0.3
=29.7

1.2×9.9×2.5
=3×0.4×9.9×2.5
=3×9.9×(0.4×2.5)
=3×9.9×1
=3×9.9
=3×(10-0.1)
=3×10-3×0.1
=30-0.3
=29.7