已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?

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已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?已知x+y=30,x-y=20,求2(x-2y)的二次方-1

已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?
已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?

已知x+y=30,x-y=20,求2(x-2y)的二次方-132的值?
x+y=30,x-y=20
解得x=25,y=5
∴2（x-2y）³－132
=2*（25-2*5）²-132
=450-132
=318

已知x+y=30,x-y=20
解之x=25 y=5
2(x-2y)^2-132
=2(15)^2-132
=450-132
=318

x+y=30,x-y=20,
x=25,y=5
2(x-2y)²-132=2*15²-132=318

X=25 Y=5 X-2Y=15 2*15=30 其二次方为900 900-132=768

解得X=25，Y=5
2(X-2Y)²-132=2(25-10)²-132=450-132=318

x+y=30,x-y=20
得x=25,y=5
2(x-2y)^2=450
2(x-2y)的二次方-132的值
450-132=318

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