合并同类项,(1)--x-x-x (2) 9ab-4ab+ab-7ab+5ab (3) -12c+6y-3+10x-2-
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/09/01 03:26:35
合并同类项,
(1)--x-x-x (2) 9ab-4ab+ab-7ab+5ab (3) -12c+6y-3+10x-2-y (4) 5m-7n-8p+5n-9m-p (5) x的二次方y的二次方+3XY-7x的二次方y的二次方-二分之五xy-1+5x的二次方y的二次方
(1)--x-x-x (2) 9ab-4ab+ab-7ab+5ab (3) -12c+6y-3+10x-2-y (4) 5m-7n-8p+5n-9m-p (5) x的二次方y的二次方+3XY-7x的二次方y的二次方-二分之五xy-1+5x的二次方y的二次方
(1)-x-x-x =(-1-1-1)x=-3x
(2) 9ab-4ab+ab-7ab+5ab=(9-4+1-7+5)ab=4ab
(3) -12x+6y-3+10x-2-y =(-12+10)x+(6-1)y-(3+2)=-2x+5y-5
(4) 5m-7n-8p+5n-9m-p=(5-9)m+(5-7)n-(8+1)p=-4m-2n-9p
(5) x²y²+3xy-7x²y²-5xy/2-1+5x²y²=(1-7+5)x²y²+(3-5/2)xy-1=-x²y²+(1/2)xy-1
(2) 9ab-4ab+ab-7ab+5ab=(9-4+1-7+5)ab=4ab
(3) -12x+6y-3+10x-2-y =(-12+10)x+(6-1)y-(3+2)=-2x+5y-5
(4) 5m-7n-8p+5n-9m-p=(5-9)m+(5-7)n-(8+1)p=-4m-2n-9p
(5) x²y²+3xy-7x²y²-5xy/2-1+5x²y²=(1-7+5)x²y²+(3-5/2)xy-1=-x²y²+(1/2)xy-1
合并同类项:(1)x-y+5x-4y (2)2/3a-1/2ab+3/4a+ab-b (3
(1) -t-t-t(2) 9ab-4ab+ab-7ab+5ab(3) -12x+6y-3+10x-2-y(4) 5m-
合并同类项(1) 2a^2b-4ab^2+3b^2a -5a^2b (2)5X^2y-6x-7x^2y+8x
2(ab-3a)-3(2ab-5a) 先去括号,在合并同类项 2x-[5x-2(3x-y)]-5y先去括号,在合并同类项
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⑴-t-t-t⑵9ab-4ab+ab-7ab+5ab⑶-12x+6y-3+10x-2-y⑷5m-7n-8p+5n-9m-
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合并同类项.)3x-2x-x -3a+2b-2a-3b3a^2b+4ab^2-a^2b-7ab^2 3x^2-2xy+y
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合并同类项: -5a^b+6ab^-4ab-2a^b+4ab+3
合并同类项:-5a^b+6ab^-4ab-2a^b+4ab+3