3 运动定律与简便运算
下面各题怎么计算简便就怎么计算.
9.12+4.5+0.88
8.43+2.97+0.03
10﹣2.75﹣0.25
4.9+4.9﹣0.9﹣0.9
5.6+2.7﹣3.6
15.25﹣3.1+0.75﹣4.9.
下面各题,怎样简便就怎样算.
(1)2.15+8.73+1.27+7.85 (2)11.87﹣(8.2+1.87) (3)5.42﹣3.87﹣1.13
(3)4.38﹣1.56+0.62﹣0.44 (4)0.4×270×2. (6)(40+1.25)×8
(7)(12.5﹣0.05)×8 (8)2.6×8.5+8.5×7.4 (9)9.9×6.9﹣6.9×3.9
(10)5.6×99+5.6 (11)2.5×(1.9+1.9+1.9+1.9) (12)7.2÷1.25÷8.
递等式计算,能简便的就简便计算.
(1)9.2×1.5÷3
(2)19.03﹣5.53﹣0.37
(3)86÷(8.6×25)
(4)6.3×101﹣6.3
(5)1.8÷3.6×(0.9+1.2)
(6)12÷0.125
(7)18.21+25.93+1.79
(8)59.6×18+59.6×81+59.6
(9)33.02﹣(148.4﹣90.85)÷2.5
(10)[33.3﹣(17.4+3.1)]×6.05.
计算下面各题.
13.4×5.6×2.5
6.75×0.12+15.73
3.25×7.4﹣8.5
1 8.7×3.3﹣15.2×2.6
45.2﹣14.36+17.6
9.43×61+24.77.
计算下面各题,能简算的请用简便方法计算.
8.38+9.43+6.62 5.86﹣1.77+2.54 47.2+8.6﹣7.2
28.6﹣3.8﹣14.6﹣6.2 8﹣2.6﹣1.77 7.4+0.93﹣4.36
17.34﹣(9.8+6.34) 0.93+5.45+7.07+4.55.
递等式计算,写出必要的计算过程,能简便计算的用简便方法计算:
(1)7.06×2.4﹣5.7
(2)5.4×99+5.4
(3)9.6×72+9.6×28
(4)(1.25×2.5)×4
(5)10.4+72×0.81
(6)11×0.6×0.4
(7)(12.8+4.99)÷0.2
(8)1.25×8+2.5×4.4.
0.25×27×4 45×36+64×45 1.25×320×25 0.96×25
9.9×999+9.9 1.08×125 8×25×1.25×16 489×101﹣489
33×1.03 28×45+30×13 5.6×9+56 0.98×54.
仔细观察,照样子计算.
(1)400÷25
=(400×4)÷(25×4)
=1600÷100
=16
900÷25=
3000÷125=
(2)900÷18
=(900÷9)÷(18÷9)
=100÷2
=50
350÷14=
630÷42=