题目
计算.
(1)
20170+2-2-()2+2017;
(2)
(-2ab)(3a2-2ab-b2);
(3)
(2a+3b)2-(2a-b)(2a+b);
(4)
(9x2y-6xy2+3xy)÷(3xy)
答案: 解:原式=1+14-14+2017=2018
解:原式=(-2ab)·3a2-(-2ab)·2ab-(-2ab)·b2=-6a3b+4a2b2+2ab3.
解:原式=4a2+12ab+9b2-4a2+b2=12ab+10b2.
解:原式=9x2y÷(3xy)-6xy2÷(3xy)+3xy÷(3xy)=3x-2y+1