2(0.5x-3)=10(0.2x-3)求解!
问题描述:
2(0.5x-3)=10(0.2x-3)求解!
答
2(0.5x-3)=10(0.2x-3)
x-6=2x-30
2x-x=30-6
x=24{3x-y-3=04x+3y=17{2x-4y=63x+5y=42告诉我,我提高悬赏,方程组第一个方程组:3x-y-3=0①4x+3y=17 ② 由①,y=3x-3③将③代入②中,得4x+3(3x-3)=174x+9x-9=1713x=26x=2y=3第二个方程组:2x-4y=6 ①3x+5y=42②由①,得 x=3+2y③将③代入②中,得3(3+2y)+5y=429+6y+5y=4211y=33y=3x=9