3 运动定律与简便运算
计算下面各题,能简算的要简算.
8.56×2.7+1.44×2.7 1.25×2.5×4×0.8
(1.79+1.2×0.1)÷0.25 5.8÷[8×(1.8﹣1.3)].
计算下面各题.(能简算的要简便计算)
7.8×9.8﹣14.5 13.4+5.62+17.6+4.38 3.6×42+4.2×64
4.8×12.5×0.8 1.76﹣[(0.74+0.26)÷0.8] (1.89+1.4×3)÷0.25.
递等式计算(能简便的用简便计算)
①21.7+1.8×3﹣22.5÷1.5 ②35.6÷0.25÷4
③7.43×8+8×1.57+8 ④(1.4+1.4+1.4+1.4)×2.5.
计算下面各题,能简便的要用简便方法计算.
1.3+0.94+0.06+7.7 6.27÷0.3+3 12.5×0.48×0.8 5.2×[(1.3+2.1)÷0.2].
用递等式计算,能简便计算的要简便计算.
0.125×0.5×0.8 60.4×0.8﹣12.8 2.8+0.6×0.35
0.2÷2.5 104×0.45 0.9×3.6+1.1×0.36.
递等式计算(能简算的要简算).
(1)2.5×0.8×0.4×12.5
(2)6.3×9.9
(3)3.93×9.8+0.2×3.93
(4)300﹣(2.03+6.1)×30
(5)(1﹣0.2)×(3﹣2.32)÷0.01
(6)8÷[(40.75﹣9.5)×0.4].
用简便方法计算下面各题.
13.2﹣3.7﹣6.3 10.26﹣(3.78+4.26) (+)×24
101×7.8 ×24+176×20% 32×12.5×O.25
8.6×+8.6÷3 700÷12.5÷8.
直接写得数:
0.002×100= 8÷100= 0÷100+72= 25×19×4=
0.83﹣0.23= 4.8+0.12= 5﹣2.7= 3.6+7.65+6.4=
用你喜欢的方法计算.
0.6+0.94﹣0.208 4.85×1.25×8 (64﹣22.4÷1.4)×1.2
18.3﹣6.25﹣3.75 2.8×3.6+1.4×2.8 6.6÷〔14.5﹣(1.7+1.8)〕
怎样简便就怎样算.
0.125×4.78×80 2.8×3.6+1.4×2.8 (0.4+40)×2.5
78.7﹣17.7×3.6 18÷[0.3×(8﹣6.5)] 12.7+12.5+0.5.
①12.5×3.7×0.8
②4.6×2.3+7.7×4.6
③3.6+(5.7+3.8)÷0.5
④3.6÷0.4﹣1.5×3
⑤0.1÷0.2÷0.4
⑥80.3﹣5.6×1.7.
计算,能简算的要简算
10÷0.2÷2.5 64×4.5+3.6×45 1.25×3.2×0.8
14.5×102 14.64+3.7×2.8 8.4÷0.21÷0.5.
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)0.3×(1×0.5÷1×0.5)
(2)1.25×6.4×2.5×5
(3)4.8×2.5+17.22÷2.1
(4)25.2×(0.32÷0.4)+8.6
(5)3.25×4.8+7.75×4.8﹣4.8
(6)6.4÷[(22.6﹣8.4×1.5)÷2.5].
用自己喜欢的方法计算.
(1)0.38×9.3+0.38×0.7
(2)9.99﹣4.26+90.01﹣5.74
(3)(3.86﹣2.66÷0.7)×1.5
(4)2.5×[1.38÷(6.9×5)].
计算下列各题(能简算要简算).
5.18+0.73+0.82 0.75×1.8÷1.5 12.5×7.1×0.8
6.12×99+6.12 8.6÷0.86+8×0.35 5.6×(18.5﹣8.5÷0.5)
计算下列各题,能简算的用简便方法计算.
26﹣3.17﹣7.83 67×38+33×38 125×25×64
29.38﹣(19.38﹣4.76) 329×87﹣87×29 5.8﹣3.62﹣0.38+0.2.
口算:
420÷60= 1﹣0.1= 99×9.9×0= 1.09+0.91= 4.35×10=
30×80= 4.2÷21= 2.5×1.9×4= 88+104+96= 67÷10=
用递等式计算.(能简算的要写出简算过程)
(1)8.5×[(2.36+2.42)÷0.25] (2)3.9÷[(1.3+0.6)×6﹣3.6] (3)4.25×6.3+3.7×4.25
(4)205×0.99 (5)25.6﹣7.49﹣2.51 (6)[2.5﹣(6.8﹣4.9)]×0.8.
递等式计算:(能简算的要简算)
①0.125×9×8×0.3 ②4.62÷5÷0.66
③5.78×2.3+5.78+5.78×6.7 ④7.75×[20÷(3.24﹣3.04)].
脱式计算(能简算的要简算)
12.03﹣22.78÷3.4 4.78×99+4.78 2.5×6.9×4
28.8÷1.2×0.6 6.8+3.2÷2.5 8.6×3.3+2.7×8.6.
递等式计算(能简算的就简算).
(1)3.37+12.89+2.63
(2)513000÷125÷8
(3)39×26+26×61
(4)31.25﹣6.29﹣4.71
(5)130×(300﹣125÷25)
(6)2748÷[216÷(155﹣83)].
脱式计算,能简算得要简算.
5.45+0.56×7.4 2.5×0.89×4 25×16.7﹣25×0.7
7.6×99 5.6×10.2 2.5×3.2×1.25
9.6÷0.4×0.25 3.56×2.8﹣1.24×0.9 (12.5+1.25)×8
(2.5×1.7)×4 12.5×8.8 0.89×100.1
0.25×0.8×4×0.125 8.4×0.26+0.74 31.7﹣0.5×0.7﹣1.65.