计算:(本题共4小题,每小题3分,共12分)(1) (2)(3) (4)
计算:
(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.