(1) | (2) | (3) | (4) | (5) |
B | C | A | C | A |
(1)x+0.6x=2.4
1.6x=2.4
x=1.5
|
(2)12x+13x=400 25x=400 x=16 |
(3) 3.6x-1.9x=1.62 2.7x=1.62 x=0.6 |
(4) 7x-4×17=37 7x-68=37 7x=105 x=15 |
(5)2.3×4+0.9x=20 9.2+0.9x=20 0.9x=10.8 x=12 |
(6)12x-7×8=124 12x-56=124 12x=180 x=15 |