4/5+1/2x=9/109/10-1/2x=4/54x+2(8-x)=2620x+15(50-x)=8800.7m:15dm

分类: 作业答案 • 2021-12-19 10:59:02

问题描述：

4/5+1/2x=9/10
9/10-1/2x=4/5
4x+2(8-x)=26
20x+15(50-x)=880
0.7m:15dm

答

1/2x=1/10 x=1/5 (1:5)
-1/2x=-1/10 x=1/5 (1:5)
4x+16-2x=26 2x=10 x=5 (5:1)
20x+750-15x=880 5x=130 x=26 (26:1)