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].
计算:(每小题4分,共8分.) (1)求的值:. (2)计算:;
计算: (1) (2) (3) (4)
计算: (1). (2). (3). (4).
(本题6分)计算: (1) (2)