3 运动定律与简便运算
直接写出得数:
0.34+0.45= 1.3﹣0.7= 3.8+0.12= 8﹣4.6=
9.14﹣1.5= 45×2= 125×8= 25×7×4=
560÷70= 415﹣74﹣26=
计算下面各题:(能简算的要简算)
6.7+25+3.3+75
103×12
14.85﹣(4.85+2.5)
15×99+15
9.14﹣1.43﹣4.57
2000÷125÷8.
直接写出得数.
0.65+0.35= 1.1﹣0.4+0.3= 45°+35°= 8×125=
25×9×4= O÷18+12= 24﹣24÷3= 6.2+5+3.8=
口算.
0.36+0.14= 7.2﹣5.8= 1﹣0.4= 0.01+0.1= 4.8+3.12=
1﹣0.08= 102×5= 20﹣20÷5= 3.9+4.4+5.1= 4.7﹣0.47﹣1.43=
25×17×4= 120÷5÷2=
直接写出得数.
0.89﹣0.29= 125×8= 1﹣0.06= 24×5= 2.5+8.5=
4×25= 5.3+4.7= 99.2+0.08= 87.3﹣4.4﹣5.6= 36×7+7×64=
怎样算简便就怎样算.(12%)
17.17﹣6.8﹣3.2﹣6.17 5.4×[(1.3+2.15)÷0.2] 8.4÷0.6+8.4÷0.4
16.8×10.1 10.9﹣0.9÷0.2+1.8 1.25×3.2×0.25.
怎样算简便就怎样算.
①2.43×99+2.43
②6.8+1.25×6.8×8
③(8.14﹣3.75)÷2.5÷4
④4.58+2.39+(5.42+7.61)
⑤6.3÷2.8
⑥26.7﹣0.5×0.5﹣0.75.
怎样算简便就怎样算.
4.32+5.43+6.68 17.17﹣6.8﹣3.2 5.29×9+5.29
16.8×10.1 2.74×9.5+5×0.274 0.36+9.6÷3.2.
口算.
1.8×0.5= 49×0.2= 10÷2.5= 0.83÷0.1= 2.4﹣0.8=
0.44÷2.2= 0.6×0.5= 0.4+0.15= 1.25×8= 0.56÷8=
12.5×18.5×0.8= 5.38+0.45+1.55= 0.42÷0.7÷0.6= 0.74×0.6+0.74×0.4=
脱式计算:(能简算的要简算)
2.4×1.5+3.6÷1.5 7.38﹣5.14+3.62﹣2.86 0.12×1.8+8.2×0.12
5.4÷[0.51÷(1.2﹣1.03)] [(8.1﹣5.6)×0.9﹣1.05]÷0.04.
4.5×8= 3.28﹣0.8= 0.8÷5= 0.84÷0.7=
1.25×0.8= 468÷4.68=2 5×4÷2.5×4= 2.8×0.1+2.8÷0.1=
脱式计算.(能简便的用简便方法)
2.18+3.7+0.82+6.3 (620+380)÷50×4 528×58+472×58
125×96×8 9.5+4.85﹣8.16 51.27﹣8.66﹣1.34.
脱式计算
①0.24+1.33﹣0.63 ②2.58﹣(3.5﹣2.4) ③19.92﹣14.4﹣0.92
④54÷(3.94+6.86) ⑤3.6÷0.4﹣1.2×5 ⑥3.4×7.8÷3.9.
计算下面各题,能用简便方法的要用简便方法计算.
(1)9.78×2.3+2.3×10.22 (2)1.5×11﹣7.83+3.5
(3)7.25÷(31﹣29.55)×1.3 (4)75.6÷[0.7×(8.5﹣7.6)].
怎样简便就怎样算.
①5.5×17.3+2.7×5.5 ②1.25×(6.2﹣5.9)×80 ③1.5×99
④70.3﹣17.48÷7.6 ⑤3.64÷52×23.3 ⑥4.6×(1﹣0.25)+0.75×5.4.
下面各题,怎样简便就怎样算.
(1)10.75﹣(2.4﹣0.86) (2)9.61﹣4.38+0.35
(3)3.87+4.92+1.13 (4)46.24﹣8.66﹣1.34
(5)21.9﹣9.22﹣0.78+8.1 (6)(745﹣25×16)÷15.
下面各题怎样算简便就怎样算.
72.8÷5.6+24.9 5.8×13.7+5.8×6.3 49×101﹣49
2.5×32×1.25 3.9÷1.5÷2 32.7+0.14×50.
4.27﹣1.72+0.73﹣2.28
12.83﹣(9.5+2.83)
16+(5.32﹣2.16)
5.6×0.125
9.8×0.99
6.2×0.35+0.35×3.8
1.2×198﹣9.8×12
1÷(1.3×28)
递等式计算,能简算的就简算.
(1)3.7+6.3×0.5
(2)21.6÷3×(20﹣19.8)
(3)2.5×2.9×4×2
(4)16.53﹣3.57﹣6.43
(5)5.28×9.8+0.2×5.28
(6)28﹣2×9.5+2.8
(7)(10﹣9.2)×(2.6﹣2.1)÷5
(8)1.5×[(3.6﹣0.36÷0.6)﹣5].
998﹣736÷32+25;
0.55×1.4+18.395÷6.5;
3.1.4+9.8×7.5﹣0.75÷2.5;
68÷(0.85×4.7+5.3×0.85);
(2÷0.25+0.25÷2)×1.2;
0.21÷[(17.4+3.6)×0.01]×2.5.