2.The result of 9y -5y is always 4对么?3.The result of 4x - 4y is always 8xy对么?4.If x is an integer,the value of the expression 2x+1 must be odd对么?5.If P=4a+2b,when a=4 and b=3,P=22对么?1.-6 is greater that -4对么?2.The sum of 2 negativ

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