Question

0.9×27+0点3×1.9用简便方法怎么计算？

Answer 1

解:可以将0.9运用乘法分配律化为0.3x3同27连乘，提取0.3，然后按四则运算法则进行计算。计算过程
0.9ⅹ27+0.3ⅹ1.9
=0.3ⅹ3ⅹ27+0.3x1.9
=0.3x(81+1.9)
=0.3ⅹ82.9
=24.87。

Answer 2

解:可以将0.9运用乘法分配律化为0.3x3同27连乘，提取0.3，然后按四则运算法则进行计算。计算过程
0.9ⅹ27+0.3ⅹ1.9
=0.3ⅹ3ⅹ27+0.3x1.9
=0.3x(81+1.9)
=0.3ⅹ82.9
=24.87。

Answer 3

0.9x27+0.3x1.9
=0.9x90x0.3+0.3x1.9
=81x0.3+0.3x1.9
=(81+1.9)x0.3
=(83一0.1)x0.3
=83x0.3一0.1x0.3
=24.9一0.03
=24.87。