Question

简便运算:0.25X0.78X4？

对这道题提出一个疑问

Answer 1

0.25×0.78×4
＝0.25×4×0.78
＝1×0.78
＝0.78

Answer 2

这道题运用了乘法的交换律
0.25×0.78×4
=0.25×4×0.78
=1×0.78
＝0.78

Answer 3

因为0.25×4=1，所以可以先计算这个
0.25×0.78×4
=0.25×4×0.78
=1×0.78
=0.78

Answer 4

简便计算，使用乘法交换律
0.25×0.78×4=0.25×4×0.78
=1×0.78=0.78

Answer 5

=0.25×4×0.78
=1×0.78
=0.78