已知x+y=30,x-y=20,则2(x-2y)-132的值为_____.
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已知x+y=30,x-y=20,则2(x-2y)-132的值为_____.
已知x+y=30,x-y=20,则2(x-2y)-132的值为_____.
已知x+y=30,x-y=20,则2(x-2y)-132的值为_____.
x+y=30,x-y=20 x=25 y=5 代入:2(x-2y)-132 =2(25-2*5)-132 =318
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已知x+y=30,x-y=20,则2(x-2y)-132的值为_____.
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