黑熊精
幼苗
共回答了19个问题采纳率:78.9% 举报
1.147÷5X=7.8 5x=147÷7.8=18.84
x=3.77
2.40‰X=0.8×3/4
x=0.8×3/4÷40‰=15
3.(X-17)÷417=309
x-17=309*417=128853
x=128870
4.2/9×18-1/4X=1.5
1/4x=4-1.5
x=10
5.5X-(7+5又2/3)=2又1/3
5x=2又1/3+7+5又2/3
x=3
6.3又1/2:(X+3)=1/6:2
x+3=2*3又1/2:1/6
x=39
7.(X+11.8):9.6=16:12
x+11.8=16*9.6:12
x=1
8.1/3:1/7=(15-X):2
15-x=2*1/3:1/7
x=31/3=10又1/3
9.4/X+3=0.6/1.2
4/x=0.5-3=-2.5
x=-4/2.5=-1.6
10.8X÷(1.8+3)=1.5
8x=1.5*(1.8+3)=7.2
x=0.9
11.21-120‰X=9
120‰X=21-9=12
x=100
1年前
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