3/10×﹙200+x﹚-2/10×﹙300-x﹚=300×9/25 5/12x-x/4=1/3 2/3-8x=3-1/2x 0.5x-0.7=6.5-1.3x

题目

3/10×﹙200+x﹚-2/10×﹙300-x﹚=300×9/25 5/12x-x/4=1/3 2/3-8x=3-1/2x 0.5x-0.7=6.5-1.3x
1/6﹙3x-6﹚=2/5x-3
3﹙x-7﹚+5﹙x-4﹚=15
4x-3﹙20-x﹚=-4
y-1/2=2-y+2/5
1/3﹙1-2x﹚=2/7﹙3x+1﹚
x+1/0.2-3x-1/0.4=1

答案

-20
7
8
29/20
1/32
3/4