3 运动定律与简便运算
用简便方法计算下面各题.
(0.86+0.86+0.86+0.86)×25 4÷1
+6×
125÷(50÷8) 7.6×
÷[1.9﹣1.9×(1.9﹣1.9)].
用你喜欢的方法计算
①375+450÷18×25 ②
×
+
÷9 ③[6.85﹣(0.65+0.7)]÷2.5
④
÷(
﹣
)×
⑤13×(
+
)×22 ⑥2272﹣6360÷24.
怎样简便就怎样计算.
①57.5﹣4.25﹣15.75 ②125×
×8×
③
×16.31﹣2.31÷
④6760÷13+17×25 ⑤99×56 ⑥
÷[(
﹣
)÷
].
简便计算.
15.6789÷20÷5 2.8×23.4+11.1×57.6+6.54×28
34.5×8.23﹣34.5+2.77×34.5 0.9999×0.7+0.1111×2.7.
用递等式计算.
①
÷[
×(
+
)] ②1.05×(3.8﹣0.8)÷6.3 ③
÷
+
÷
④307×99+307 ⑤
×43+56×75%+0.75 ⑥10﹣
﹣4.25.
用递等式计算,能简算的要简算.
1485+290÷58 0.125×32×0.25 1080﹣63.58﹣36.42
(
+
)×24 168.1÷(4.3×2﹣0.4) (
+
)÷(
﹣
)
脱式计算.(能简算的要简算)
(1)8470﹣104×65 (2)168.1÷(4.3×2﹣0.4) (3)(4÷7+
)×5﹣
(4)1110÷[56×(
﹣
)] (5)2.5×(1.9+1.9+1.9+1.9) (6)3.64÷4+4.36×25%
递等式计算(能简便的要简便)
①(
+
)÷
②2.5×13×0.42 ③5.3×12﹣33.46÷0.35
④
÷[(
+
)×
] ⑤9.34﹣(2.34+0.49) ⑥
+
×19.
计算下面各题,能用简便方法算的要用简便方法算.
①7.28﹣(1.25+0.28)
②9990×200.8+1×2008
③57×
+27×
④0.8×4×12.5×2.5
⑤
÷[(
+
)×
].
计算下面各题,怎样简便就怎样算.
33.02﹣(148.4﹣90.85)÷2.5 4
×0.6+0.6÷
(1÷
+
÷1)÷5.1 18.1+(3
﹣0.299÷0.23)×1
.
(70+
)×
.
+
×99+
(4)2
﹣2.86×(6.25﹣6
)

(
﹣
.
×3.6+
×
+3.6
÷〔(
+
)×
〕
×0.11+0.11×
)×25
﹣
+6.625×37.5%
+
﹣
)
= 45×99= 0.9×99+0.9=
=
=
﹣
+
﹣
(2.5×73)×0.4 6.8﹣1.36﹣0.64.
﹣
﹣
③52.8×25﹣52.8×24
⑤24×(
+
) ⑥
÷1﹣(
).
+
[7.6﹣(3.85+2.6)]×0.4
+
)×8+
(
+
+
)×24 2﹣2÷3+
.
+
﹣
)×42
﹣
+
)÷
+
3.6÷[0.6×(0.8+0.7)].
÷(
﹣
) 3.6×99+3.6
×
)
×
+
÷
72×(
﹣
)
+
)×17.
﹣(0.16+1
+99
(4)4.03÷12.5.
×17﹣17×
2.5×3.2×1.25 2.8﹣5.5+7.2﹣4.5
÷[(
+
].
﹣
+
﹣
×
﹣
÷13
+250×
×12.5×
×8.
+4÷
②5×
×
×
③41×101
+
﹣
) ⑥
﹣(
﹣
)
+2.2×25% (
﹣
×
)÷
÷
﹣
×
+
÷4﹣
(
﹣
+
)×12
÷(
×
)﹣
.
+
)×24 1.25×2.5×32
﹣
)]×
45×102
÷(3﹣
﹣
)
﹣(3
+0.4) ②1.8×
+2.2×25%
﹣10.5×
)÷4
④2
÷[5
﹣4.5×(20%+
)].
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