Question

3y-1/2=1/3 x-8=2x+7 2x=5x-1 9-10x=9x-10 4/5x=5x-21

Answer 1

解方程得窍门:把未知数一边的通过4则运算化简最后剩下未知数,即可求得方程.

(1)3y-1/2=1/3

3y=1/3 +1/2

3y=5/6

y=5/18

(2)x-8=2x+7

x=2x+7+8

x=2x+15

0=x+15

x=-15

(3)2x=5x-1

0=3x-1

3x=1

x=1/3

(4)9-10x=9x-10

9=19x-10

19=19x

x=1

(5)4/5x=5x-21

4x=25x-105

105=21x

x=5