计算:(1)-22+30-(-12)-1(2)(-2a)3-(-a)-(3a)2(3)(x+2)2-(x-1)(x-2)(4)(a+b)2(a-b)2(5)(a
题型:解答题难度:一般来源:不详
计算: (1)-22+30-(-)-1 (2)(-2a)3-(-a)-(3a)2 (3)(x+2)2-(x-1)(x-2) (4)(a+b)2(a-b)2 (5)(a-3)(a+3)(a2+9) (6)(m-2n+3)(m+2n-3) |
答案
(1)原式=-4+1-(-2)=-1; (2)原式=-8a3+9a3=a3; (3)原式=x2+4x+4-(x2-3x+2)=x2+4x+4-x2+3x-27x+2; (4)原式=(a2-b2)2=a4-2a2b2+b4; (5)原式=(a2-9)(a2+9)=a4-81; (6)原式=m2-(2n-3)2=m2-4n2+12n-9. |
举一反三
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