合并同类项(1)3a-5a+6a. (2)x2y+4x2y-6x2y.(3)-3mn2+8m2n-7mn2+m2n. (4)2x3-
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合并同类项 (1)3a-5a+6a. (2)x2y+4x2y-6x2y. (3)-3mn2+8m2n-7mn2+m2n. (4)2x3-6x-6x3-2+9x+8. |
答案
(1)3a-5a+6a=(3-5+6)a=4a. (2)x2y+4x2y-6x2y=(1+4-6)x2y=-x2y. (3)-3mn2+8m2n-7mn2+m2n=(-3-7)mn2+(8+1)m2n=-10mn2+9m2n. (4)2x3-6x-6x3-2+9x+8=(2-6)x3+(-6+9)x+(-2+8)=-4x3+3x+6. |
举一反三
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