问题
解答题
①(-10)2+(-10)0+(
②(x-
③已知m=2,n=1,求[(3mn+1)(3mn-1)+3mn+1]÷m的值. ④已知a+b=10,ab=24,求(a-b)2. |
答案
①原式=100+1+2
=103;
②原式=x2-x+
;1 4
③原式=(9m2n2-1+3mn+1)÷m
=(9m2n2+3mn)÷m
=9mn2+3n,
当m=2,n=1时,原式=9×2×1+3=21;
④∵a+b=10,ab=24,
∴原式=a2-2ab+b2=(a+b)2-4ab
=100-96
=4.