7x+2x=4.5

问题描述:

7x+2x=4.5

0.5

x=0.5

9x=4.5 x=0.5

9X=4.5
X=0.5

7x + 2x = 4.5
(7 + 2)x = 4.5
9x = 4.5
x = 4.5÷9
x= 0.5

X=0.5