解方程,把过程写出来!
问题描述:
解方程,把过程写出来!
(1)x+1/3x=4/5 (2) 5/2x=3/2*7 (3)1/6x-2/9=1/9(4)(1+3/4)=1/3+1/4
谢谢咯
答
(1)
x+1/3x=4/5
x(1+1/3)=4/5
4/3x=4/5
x=4/5÷4/3
x=4/5×3/4
x=3/5
(2)
5/2x=3/2*7
5/2x=21/2
5x=21
x=21/5
(3)
1/6x-2/9=1/9
1/6x=1/9+2/9
1/6x=3/9
1/6x=1/3
x=1/2
(4)
(1+3/4)x=1/3+1/4
7/4x=4/12+3/12
7/4x=7/12
x=7/12×4/7
x=4/12
x=1/3