人教版五年级下册数学书第74页做一做详细解答过程和答案
第74页做一做第1题详细解答过程和答案> =
(说一说略)
第74页做一做第2题详细解答过程和答案
5/6和7/8:
5/6=(5×4)/(6×4)=20/24
7/8=(7×3)/(8×3)=21/24
3/7和2/9:
3/7=(3×9)/(7×9)=27/63
2/9=(2×7)/(9×7)=14/63
4/9和7/18:
4/9(4×2)/(9×2)=8/18
7/18=7/18
3/8和5/9:
3/8=(3×9)/(8×9)=27/72
5/9=(5×8)/(9×8)=40/72
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