7x+2y=52 7x+4y=62
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7x+2y=527x+4y=627x+2y=527x+4y=627x+2y=527x+4y=62相减4y-2y=62-52所以y=5x=(52-2y)/7=6x=6y=5y=5x=6你要问啥7x+4y
7x+2y=52 7x+4y=62
7x+2y=52 7x+4y=62
7x+2y=52 7x+4y=62
相减
4y-2y=62-52
所以y=5
x=(52-2y)/7=6
x=6
y=5
y=5 x=6
你要问啥
7x+4y-(7x+2y)=62-52=4y-2y=2y,y=5,7x+2*5=52,7x=42,x=6
7X+2Y=52(1)
7X+4Y=62(2)
用(2)减(1)7X+4Y-7X-2Y=62-52
2Y=10 Y=5
然后用Y=5带入(1)式得X=6
7x+4y=62减去7x+2y=52得:2y=10 y=5把y等于5带入7x+2y=52得:x=8.5
x=6,y=5;这么简单的题都还不会,你年纪应该还很小吧,不要经常上网哦
7x+2y=52① 7x+4y=62②
②-①得2y=10 y=5
y=5带入①得x=6
故x=6 y=5
第二个式子减去第一个式子 2y=10 y=5 带入得 x=6
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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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