计算:(1)(12)-2-23×0.125+20120+|-1|(2)(-m)2-(m2)2÷m3(3)-2a2(12ab+b2)-5ab(a2-ab)
题型:解答题难度:一般来源:不详
计算: (1)()-2-23×0.125+20120+|-1| (2)(-m)2-(m2)2÷m3 (3)-2a2(12ab+b2)-5ab(a2-ab) (4)(4x+3y)(3y-4x)-(4x+3y)2 (5)(x-3y+1)(x+3y-1) (6)(2x+1)2(2x-1)2. |
答案
(1)原式=4-8×0.125+1+1=4-1+1+1=5; (2)原式=m2•m4÷m3=m3; (3)原式=-24a3b-2a2b2-5a3b+5a2b2=-29a3b+3a2b2; (4)原式=9y2-16x2-(16x2+24xy+9y2)=9y2-16x2-16x2-24xy-9y2=-32x2-24xy; (5)原式=x2-(3y-1)2=x2-9y2+6y-1; (6)原式=[(2x+1)(2x-1)]2=(4x2-1)2=16x4-8x2+1. |
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