f1f02
幼苗
共回答了16个问题采纳率:75% 举报
1)(8+11/13)-(2.75+1+11/13)+(5+3/4)
=8+11/13-2.75-1-11/13+5+3/4
=12-2.75+3/4
=12-2.75+0.75
=12-2
=10
2)51*2.08+1.7*37.6
=(50+1)*2.08+(2-0.3)*37.6
=50*2.08+2.08+75.2-0.3*37.6
=104+2.08+75.2-11.28
=188.4
3)18*2/11-0.65*7/13+9*18/11+0.65/(13/7)
=18*2/11+9*18/11+0.65/(13/7)-0.65*7/13
=18*11/11+0.65(7/13-7/13)
=18
3)
1年前
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