计算(写出计算过程).(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
试题:
计算(写出计算过程). (1)(-3.14)+(+4.96)+(+2.14)+(-7.96) (2)(-2)+(+5)+(-3)+(+1.125)+(+4) (3)(-3.2)×1.5 (4)1×(-8) (5)(-4)××(-25)×(-6). (6)24×(--) (7)(---)×(-36) (8)-99×9 (9)2011×2×0×(-389) (10)-125÷(-25)-64÷(-4) (11)2×(-3)2-5÷×2 (12)(-2)3×8-8×()3+8÷. |
有理数的混合运算
答案:
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96) =-3.14+2.14+4.96-7.96 =-1-3 =-4;(2)(-2)+(+5)+(-3)+(+1.125)+(+4) =-2.125+1.125-3.5+4.5+5 =-1+1+5 =5;(3)(-3.2)×1.5 =-4.8;(4)1×(-8) =-22;(5)(-4)××(-25)×(-6) =-4××25×6 =-200;(6)24×(--) =24×-24×-24× =3-4-6 =-7;(7)(---)×(-36) =×(-36)-×(-36)-×(-36)-×(-36) =-9+4+2+3 =0;(8)-99×9 =(-100+)×9 =-100×9+×9 =-900+ =-899;(9)2011×2×0×(-389) =0;(10)-125÷(-25)-64÷(-4) =5+16 =21;(11)2×(-3)2-5÷×2 =2×9-5×2×2 =18-20 =-2;(12)(-2)3×8-8×()3+8÷ =-8×8-8×+8×8 =-64-1+64 =-1. |