)计算(1) -26-(-15) (2)(+7)+(-4)-(-3)-14 (3)(-3)×÷(-2)×(-) (4)-(3-5)+32×(-3)
7a2b-(-4 a2b+5ab2)-2 (2 a2b-3 ab2)
9x 3-[-6x2+3(x3-x2)]
、
化简:.
计算:.