0.5x+0.8y=4.7……① 0.6x+1.2y=6.6……② ①×3得:1.5x+2.4y=14.1……③ ②×2得:1.2x+2.4y=13.2……④ ③-④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