5x+4y=144 (1)2x+y=40 (2)
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5x+4y=144(1)2x+y=40(2)5x+4y=144(1)2x+y=40(2)5x+4y=144(1)2x+y=40(2)(2)×4得:8x+4y=160(3)有(3)-(1)得3x=16x
5x+4y=144 (1)2x+y=40 (2)
5x+4y=144 (1)
2x+y=40 (2)
5x+4y=144 (1)2x+y=40 (2)
(2)×4得:8x+4y=160 (3)
有(3)-(1)得
3x=16
x=16/3
由(2)知:y=40-2x=40-32/3=88/3
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
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