(1)计算: | − 4 | × ( 3 − 1 ) 0 − 2
(2)解不等式: 3 x > 2 ( x + 1 ) − 1 .
(5分)计算:
计算:
5yx-3x2y-7xy2+6xy-12xy+7xy2+8x2y.
(2a2-1+2a)-3(a-1+a2)