计算: (1)1+2.25+(+3.625)+(-2)+(-1.4)+(-3); (2)(- +0.75- )×(-36); (3)[-×(- )+(- )÷]÷(-2)3; (4)-12015-[-3×(2÷3)2+22]- ; (5)x2y-3xy2+2yx2-xy2; (6)5a2-[3a-2(a-3)+4a2].
,其中,
7a2b-(-4 a2b+5ab2)-2 (2 a2b-3 ab2)
9x 3-[-6x2+3(x3-x2)]
、
化简:.