已知x+y=2,求3(x+y)-4x-4y+5的值
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已知x+y=2,求3(x+y)-4x-4y+5的值已知x+y=2,求3(x+y)-4x-4y+5的值已知x+y=2,求3(x+y)-4x-4y+5的值3(x+y)-4x-4y+5=3(x+y)-4(x
已知x+y=2,求3(x+y)-4x-4y+5的值
已知x+y=2,求3(x+y)-4x-4y+5的值
已知x+y=2,求3(x+y)-4x-4y+5的值
3(x+y)-4x-4y+5
=3(x+y)-4(x+y)+5
=6-8+5
=3
2+4+2x+4y=4*5
x+2y=7
5+7+4x+6y=4*9
x+3/2y=6
y/2=1
y=2
x=7-2y=3
x^2+y^3=3^2+2^3=9+8=17
3
把原式变为3(x+y)-4(x+y)+5, 把2代入就行了,6-8+5=3
3
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