解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5
问题描述:
解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5
答对有分!
答
(1)1.69/(X-2)=1.3
1.3/(x-2)=1
1.3=x-2
x=3.3
(2).X:9/7=14:3.6
x*3.6=14*9/7
x*3.6=18
x=5
(3).1/(X+2/3)=4/5
4*(x+2/3)=5
4x+8/3=5
4x=7/3
x=7/12