2.8x+x=1.71 30x+15x=22.5 2.8+2x=22.6 22.6-2x=2.8 (0.23-0.19)x 40×4+2x=400 62×2+2x=358 解方程 急

问题描述:

2.8x+x=1.71 30x+15x=22.5 2.8+2x=22.6 22.6-2x=2.8 (0.23-0.19)x 40×4+2x=400 62×2+2x=358 解方程 急

(1)2.8x+x=1.71 3.8x=1.71 x=0.45 (2)30x+15x=22.545X = 22.5X= 0.5(3) 2.8+2x=22.6 2X= 22.6-2.82X=19.8X =9.9(4) 22.6-2x=2.8 -2X = -22.6+.2.8-2X=-19.8X =9.9(5)(0.23-0.19)x 40×4+2x=4006.4+ 2X =4002X =...