1.5×5/8+7×5/82.3/4×5/7-3/4×1/73.7/8×3/17×5/74.11/19×2/7×5/11
1个回答
1、原式=(5+7)×5/8=15/2
2、原式=3/4×(5/7-1/7)=3/7
3、原式=7/8×5/7×3/17=15/136
4、原式=11/19×5/11×2/7 =10/133
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