Question

67.8×3.2+6.8×67.8用简便方法怎么算？

这个用简便方法怎么算

Answer 1

67.8×3.2+6.8×67.8
=67.8×（3.2+6.8）
=67.8x10
=678

Answer 2

67.8×3.2+6.8×67.8
= 67.8×(3.2+6.8)
= 67.8×10
= 678

Answer 3

67.8x3.2+6.8x67.8
=67.8X(3.2+6.8) 乘法对于加法的结合律
=67.8X10
=678