×40= | - = | × = | 2× = | 24× = |
×22= | 18× = | × = | × = | × = |
×40=36; ②
-
=
; ③
×
=
; ④2×
=
; ⑤24×
=8;⑥
×22=4; ⑦18×
=3; ⑧
×
=
; ⑨
×
=
; ⑩
×
=
.分析:①③⑤⑥⑦⑧⑨⑩注意约分计算;②通分计算;④用整数与分子相乘的积做分子,分母不变.
点评:此题考查了通过约分、通分等进行分数计算的能力.