2⼀(-3⼀7)*4⼀7⼀(-5又1⼀7: 【15又1⼀2-(1又2⼀5+3又1⼀2】⼀(1又1⼀8): 1⼀5*(-5)⼀(-1⼀5)*5:

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2025-01-05 00:26:04
推荐回答(1个)
回答1:

2/(-3/7)*4/7/(-5又1/7):
=2*(7/3)*4/7*(7/36)
=14/3*1/9
=14/27
【15又1/2-(1又2/5+3又1/2】/(1又1/8)
=[31/2-7/5-7/2]*8/9
=(12-7/5)*8/9
=53/5*8/9
=424/45
1/5*(-5)/(-1/5)*5
=-1/(-1)
=1