1: ① 2/9--7/16×2/9=2/9×﹙1-- 7/16﹚=2/9×9/16=1/8
② 2/5×4×3/4=6/5
③ 1/2×1/15+1/3×1/2=1/2×﹙1/15+1/3﹚=1/2×2/5=1/5
④ 4/5×7/9×5/8=7/18
⑤ 5/6×5/9+5/9×1/6=5/9×﹙5/6+1/6﹚=5/9
⑥ 5/7×16×21/5=48
2: 5 1 3: 6/5 20/63 2/5 1------ 13/18 13/2 2
4: 70×1/3×15=350﹙吨﹚
5: 1/50×42×100=84吨
6: 22/3 1/14 6 1/2 40/13 40
7: 1/4×5=5/4盆 1/4×3=3/2盆
8 (1) 不对 5--3×7/9=5--7/3=8/3
(2) 不对 4/11+2/11×11/6=4/11+1/3=12/33+11/33=23/33
9: 1/2×4=2千克 |