(1) | (2) | (3) | (4) | (5) |
A | A | C | B | A |
(1)2x+52x=162
54x=162
x=3 |
(2)10.5x-7.5x=0.9
3x=0.9
x=0.3
|
(3)5x-2.5x=5
2.5x=5
x=2
|
(4)4.2x+3×1.3=16.5 4.2x+3.9=16.5 4.2x=12.6 x=3 |
(5)5x-0.5×32=48 5x-16=48 5x=64 x=12.8 |
(6) 9y÷2=20.5+20 9y÷2=40.5 9y=81 y=9 |