4.4×57.8+45.3×5.6 用简便运算_数学解答

4.4×57.8+45.3×5.6 用简便运算

人气：108 ℃　时间：2020-04-23 06:51:52

解答

=4.4×57.8+(57.8-12.5)×5.6
=4.4×57.8+5.6×57.8-12.5×5.6
=(4.4+5.6)×57.8-12.5×0.8×7
=10×57.8-10×7
=578-70
=508