简算题
问题描述:
简算题
第一题 3 3/5×25 2/5+37.9×6 2/5
(3 3/5也就是三又五分之三)
第二题 6.8×16.8+19.3×3.2
注意:一定要简算
答
3.6X25.4+37.9x6.4
=3.6X25.4+(25.4+12.5)X6.4
=(3.6+6.4)X25.4+12.5X6.4
=254+80
=334
6.8X16.8+(16.8+2.5)X3.2
=16.8X(6.8+3.2)+2.5x3.2
=168+8
=176