①a(a-2b)-(a-b)2②(2x-2)(3x+2)③(-6a2b5c)÷(-2ab2)2④[(-3xy4)2×x3-x2y2×(3xy)3]÷9x5y3
题型:解答题难度:一般来源:不详
①a(a-2b)-(a-b)2 ②(2x-2)(3x+2) ③(-6a2b5c)÷(-2ab2)2 ④[(-3xy4)2×x3-x2y2×(3xy)3]÷9x5y3 |
答案
①a(a-2b)-(a-b)2, =a2-2ab-a2+2ab-b2, =-b2;
②(2x-2)(3x+2), =6x2+4x-6x-4, =6x2-2x-4;
③(-6a2b5c)÷(-2ab2)2, =(-6a2b5c)÷4a2b4, =-bc;
④[(-3xy4)2×x3-x2y2×(3xy)3]÷9x5y3, =[9x2y8×x3-x2y2×27x3y3]÷9x5y3, =[9x5y8-27x5y5]÷9x5y3, =y5-3y2. |
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