(1)①-②得5X=5 X=1 带入①得Y=3/11 (2)②×2得4X+2Y=2③ ①-③得X=5 代入②得Y=-9 (3)①×4得12X+16Y=20③ ②×3得12X+15Y=18④ ③-④得Y=2 代入①得X=-1
(1)7x+3y=18 2x+3y=13 (2)5x+2y=7 2x+y=1 (3)3x+4y=5 4x+5y=6如题
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