2X+3Y=18 3X+2Y=19 求x、y的值
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2X+3Y=183X+2Y=19求x、y的值2X+3Y=183X+2Y=19求x、y的值2X+3Y=183X+2Y=19求x、y的值2X+3Y=18(1)3X+2Y=19(2)(1)×2得4x+6y=
2X+3Y=18 3X+2Y=19 求x、y的值
2X+3Y=18 3X+2Y=19 求x、y的值
2X+3Y=18 3X+2Y=19 求x、y的值
2X+3Y=18 (1)
3X+2Y=19 (2)
(1)×2得 4x+6y=36 (3)
(2)×3得 9x+6y=57 (4)
(4)-(3)得 5x=21
x=4.2
代入(1)得
8.4+3y=18
y=3.2
(1)×3-(2)×2得
5y=16
∴y=16/5
把y=16/5代入(1)得
2x+48/5=18
x=21/5
∴方程的解是
x=21/5
y=18/5
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