﹛3x-2y=0① ﹛7x-3y=10② (1)×3得 9x-6y=0 (3)(2)×2得 14x-6y=20 (4）(4)-(3)得 5x=20x=4把x=4代入（1）得y=6所以原方程组的解为{x=4{y=6﹛4a+5b=-19 ① ﹛3a-2b=3② (1)×2得8a+10b=-38 (3)(2)×5得15a-10b=15 (...