(10分)(1)计算:22+(-1)4+(-2)0-|-3|;(2)先化简,再求值:(4ab3-8a2b2)÷4ab+(2a+b)(2a-b),其中a=2,b=1.
计算:(第(1)题3分,其余各题每题4分,共19分)(1)-3-(-4)+7 (2)(3) (4)(5)
(每小题4分,共8分)计算:(1)(2)
①;
②