1.33/34X29 2.9/20-11/30+13/42-15/56+17/72-19/90

dfghk2022-10-04 11:39:541条回答

1.33/34X29 2.9/20-11/30+13/42-15/56+17/72-19/90
3.5/17x36又12/13-15X1/17+1/17x5/13

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mars_mqp 共回答了16个问题 | 采纳率93.8%: 1 、 33/34X29 = (1 - 1/34)x29=29-29/34 =28又5/34
2 、 9/20-11/30+13/42-15/56+17/72-19/90
=1/4+1/5 -1/5 -1/6 +1/6 +1/7 -1/7 -1/8 + 1/8 + 1/9 -1/9 -1/10
=1/4 -1/10
=3/20
3 、5/17x36又12/13-15X1/17+1/17x5/13
=5/17x36又12/13 +1/17x5/13 -15X1/17
=5/17x36 + 5/17 x 12/13 + 5/17 x 1/13 -15X1/17
=5/17 x 37 -5/17 x 3
=5/17 x 34
=10; 1年前