3解方程。(每题3分,共18分)
4x+x = 19.5 26.4-3x = 15.3 7x = 98
x-3×4 = 12 5x-x+14 = 18 2x-0.5×2 = 0.8
4、解方程:12分
4X-7=21 4.5X+5.4=14.4 5.8X+3.5X-7=14.39 13.5-2X=1.5
5解方程。9分
4χ÷24=38 (χ-3.5)×8=26.4 12.4 y-3.6 y=52.8