0.5x+0.8y=4.7……① 0.6x+1.2y=6.6……②①×3得:1.5x+2.4y=14.1……③②×2得:1.2x+2.4y=13.2……④③-④得:0.3x=0.9,解得:x=3把x=3代人①得:1.5+0.8y=4.7,解得:y=4∴{x=3 y=4
0.5X+0.8y=4.7,0.6X+1.2y=6.6x=3y=4