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].
(1)÷(-5)=____;(2)(-0.8)×(-0.5)=____;
计算:(1)-7-3=______(2)5.8-(-3.6)=_____(3)_______
计算:x2·x3+·(-2x2)2+24x7÷(-4x2)
计算:
化简:.