(1)-1^4-2×(-3)^2÷1/4 (2)3a^2-2a-(4a^2+7a) (3)2(x^2-x+1)-(-2x+3x^2)+(1-x) 时时刻刻刷新
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![(1)-1^4-2×(-3)^2÷1/4 (2)3a^2-2a-(4a^2+7a) (3)2(x^2-x+1)-(-2x+3x^2)+(1-x) 时时刻刻刷新](/uploads/image/z/2606496-24-6.jpg?t=%EF%BC%881%EF%BC%89-1%5E4-2%C3%97%28-3%29%5E2%C3%B71%2F4+%EF%BC%882%EF%BC%893a%5E2-2a-%284a%5E2%2B7a%29+%283%292%28x%5E2-x%2B1%29-%28-2x%2B3x%5E2%29%2B%281-x%29+%E6%97%B6%E6%97%B6%E5%88%BB%E5%88%BB%E5%88%B7%E6%96%B0)
(1)-1^4-2×(-3)^2÷1/4 (2)3a^2-2a-(4a^2+7a) (3)2(x^2-x+1)-(-2x+3x^2)+(1-x) 时时刻刻刷新
(1)-1^4-2×(-3)^2÷1/4 (2)3a^2-2a-(4a^2+7a) (3)2(x^2-x+1)-(-2x+3x^2)+(1-x) 时时刻刻刷新
(1)-1^4-2×(-3)^2÷1/4 (2)3a^2-2a-(4a^2+7a) (3)2(x^2-x+1)-(-2x+3x^2)+(1-x) 时时刻刻刷新
(1)-1^4-2×(-3)^2÷1/4
=-1-2×9×4
=-73
(2)3a^2-2a-(4a^2+7a)
=3a²-2a-4a²-7a
=-a²-9a
(3)2(x^2-x+1)-(-2x+3x^2)+(1-x)
=2x²-2x+2+2x-3x²+1-x
=-x²-x+3