3 运动定律与简便运算
(1)
+3.52+
+48% (2)
×
+
(3)
÷(5﹣3.9×
)
(4)25﹣25×
(5)1000÷32÷0.25÷0.125 (6)38
﹣15.38+61.25﹣4.62.
直接写出得数
3500﹣700= 0.4×0.2= 9﹣0.9= 24÷
= 204÷2=
+
= 3.2﹣2
= 2
+
= 1÷
×1÷
= 0.9+99×0.9=
脱式计算:
0.75÷0.25+
×
(8.6×0.5﹣
)÷12
÷[
﹣(
+
)]
[800×(1+25%)﹣360×1.5]÷25% 15﹣[
+(2.5﹣
)]÷0.125.
(1)17690÷58×89﹣6759 (2)7.35+2.65×(3.9﹣7.632÷2.4)
(3)36
﹣8.325+21
﹣1
(4)27
×60+9
×96.
用你喜欢的方法计算.
0.125×32×2.5 6.7×0.9+3.3×0.9 (
﹣
+
)÷
18.7×98+18.7+18.7 0.65×14+87×65%﹣
.
计算下面各题,能简便的要简便计算.
4.5+7.8×2.5÷1.3 75×60%+4×
+0.6 3×(
+
)﹣
3.4×99+3.4
12.5×3.2×2.5 12×(
+
﹣
)
﹣
x=
x:
=36:18.
计算.
2009×
24×(
﹣
+
) (3.12+0.9)÷[(1﹣0.4)÷0.1]
(4.7+3
)÷[(4
﹣3.5)×2
]
χ﹣1=0.9×
:
=8:χ
计算(要灵活使用运算律哟).
×
+
÷
= ;
7.28﹣3.14+1.72﹣2.86= ;
(
+
﹣
)×36= ;
[(5﹣4.75)÷1+2.7]×0.4= .
直接写得数
﹣
= 27×
= (
+
)×12=
×3÷
×3= 1.25×4×8=
420﹣98= 0.4×0.5= 0.23= 0.1+99×0.1= 0.36÷0.06=
用递等式计算(能简算的要简算)
798+10570÷35
×2.5×
×4 187×99
2.5÷[(17.2﹣4.5×3.6)÷0.04] 24×(
﹣
+
) 4.63×75%+6.47×
﹣0.75.





﹣
)÷(
÷
)
×
÷[1﹣(
+
)].
.
÷
+
×
+
+6.875+
÷(
﹣
)×
〔
﹣(
﹣
.
= 1.9×2×0.5=
=
=
= 0.9÷99×0.9=
=
÷
+
×
36×
+65×25%﹣1÷4
+
×
+
1743+2.56﹣743+7.44.
×60+8÷2
12×(
+
﹣
) 4
﹣(1
+1
)
×〔
﹣(
+
)〕 4×12.5×
×8.5+
×7.5)÷15.
×
÷
②72+28×35 ③
÷7+
×
﹣
+
) ⑤72﹣9÷2.5 ⑥
÷[
×(
+
)].
+
÷
7÷
×
÷[
÷(
﹣
)] (2)1375+450÷18×6
﹣(
+
) (4)
×99.
)+3.6] 31.9×8﹣0.8×319.
=
= 7.95﹣0.73﹣0.27=
÷14×
= .
×
﹣
÷〔(
﹣
)×
〕
×
﹣
÷
×
.
+
﹣
)×72 4.5÷[(
﹣3÷7.5)×3
].
×
﹣
÷〔
×(
+
)〕
÷(5﹣3×
) 84×0.25+
×16 48×(
﹣
+
)
÷
﹣
×
7.8×101 (1﹣0.8×
)÷
.
+
×60% 12.5×25%×20+3.2
÷7 
.
+
÷
﹣
÷[
×(
+
)]
②

⑥
.
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