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答案:
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1.1)(x y)x (x-y)y
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2.分解因式:xA、(x-y)(x-y 1)B、(x-y)(x-y-1)C、(x y)(x-y 1)D、(x y)(x-y-1)
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3.(x y)2-4(x y)(x-y) 4(x-y)2.
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4.若有下列程序段: int x=1, y=2; x=x y; y=x-y; x=x-y; 则执行后x和y的值分别为( )。A.x=1, y=2B.x=2, y=2C.x=2, y=1D.x=1, y=1
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5.x y x-y z x z y-x-z - y z z x-y .
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6.分解因式:xA、(x﹣y)(x﹣y 1)B、(x﹣y)(x﹣y﹣1)C、(x y)(x﹣y 1)D、(x y)(x﹣y﹣1)
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7.设x和y均为int型变量,则以下语句:x= x y;y=x-y;x= x-y;的功能是【 】。
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8.设f (x, y) = xy,则f (x + y, x-y) = ( )
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9.(2024年预测)已知集合A={(x,y)|x-y=0},B={(x,y)|y=x²},则A∩B= ( )
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10.3. int x,y,z; x=y=1; z(x , y,y ); x=