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

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

人气：492 ℃　时间：2020-01-29 08:10:45

解答

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)