二元一次方程组7+x-3y/4=2x-y+5/3;10(x-y)-4(1-x)/3=y
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二元一次方程组7+x-3y/4=2x-y+5/3;10(x-y)-4(1-x)/3=y
7+x-3y/4=2x-y+5/3;
84+3(x-3y)=24x-4(y+5)
84+3x-9y=24x-4y-20
21x+5y=104 (1)
10(x-y)-4(1-x)/3=y
30(x-y)-4(1-x)=3y
30x-30y-4+4x=3y
34x-33y=4 (2)
(1)*33+(2)*5得
33*(21x+5y)+5*(34x-33y)=104*33+4*5
693x+165y+170x-165y=3432+20
863x=3452
x=4
y=4
84+3(x-3y)=24x-4(y+5)
84+3x-9y=24x-4y-20
21x+5y=104 (1)
10(x-y)-4(1-x)/3=y
30(x-y)-4(1-x)=3y
30x-30y-4+4x=3y
34x-33y=4 (2)
(1)*33+(2)*5得
33*(21x+5y)+5*(34x-33y)=104*33+4*5
693x+165y+170x-165y=3432+20
863x=3452
x=4
y=4
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