先去括号,在合并同类项 ①-(x+y)+(3x-7y) ②2a+2(a+1)-3(a-1) ③4a^2-3a+3-3(-a^3+2a^2+1)
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![先去括号,在合并同类项 ①-(x+y)+(3x-7y) ②2a+2(a+1)-3(a-1) ③4a^2-3a+3-3(-a^3+2a^2+1)](/uploads/image/z/1125361-1-1.jpg?t=%E5%85%88%E5%8E%BB%E6%8B%AC%E5%8F%B7%2C%E5%9C%A8%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9+%E2%91%A0-%EF%BC%88x%2By%EF%BC%89%2B%EF%BC%883x-7y%EF%BC%89+%E2%91%A12a%2B2%EF%BC%88a%2B1%EF%BC%89-3%EF%BC%88a-1%EF%BC%89+%E2%91%A24a%5E2-3a%2B3-3%28-a%5E3%2B2a%5E2%2B1%29)
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先去括号,在合并同类项 ①-(x+y)+(3x-7y) ②2a+2(a+1)-3(a-1) ③4a^2-3a+3-3(-a^3+2a^2+1)
先去括号,在合并同类项 ①-(x+y)+(3x-7y) ②2a+2(a+1)-3(a-1) ③4a^2-3a+3-3(-a^3+2a^2+1)
先去括号,在合并同类项 ①-(x+y)+(3x-7y) ②2a+2(a+1)-3(a-1) ③4a^2-3a+3-3(-a^3+2a^2+1)
①-(x+y)+(3x-7y)
=-x-y+3x-7y=2x-8y
②2a+2(a+1)-3(a-1)
=2a+2a+2-3a+3=a+5
③4a^2-3a+3-3(-a^3+2a^2+1)
=4a^2-3a+3+3a^3-6a^2-3
=3a^3-2a^2-3a
=a(3a^2-2a-3)
(1)原式=- x-y+3x-7y=2x-8y (2)原式=2a+2a+2-3a+3=a+5
(3)原式=4a^2-3a+3+3a^3-6a^2-3=+3a^3-2a^2-3a
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