3 运动定律与简便运算
选择最合理的方法进行计算
99
×24 4
×
﹣3
÷1
+1÷3.8×3
+3.5
(9
﹣3.25)÷2
+1.05 2
÷[(5
﹣3
)×15] [5﹣(9
﹣4
)×
]÷1
.
计算下面各题(能用简便方法计算的要用简便方法计算).
(1)2﹣
﹣
﹣
(2)0.8+
+0.2
(3)15﹣5÷12﹣
(4)7.8×1.17﹣7.8×0.17
(5)0.25+
+
+
(6)
+
﹣
.
找窍门,怎样算简便就怎样算.
(1)
×
﹣
÷
(2)4﹣
﹣
(3)3
×[(1
+
)×2
]
(4)[
﹣0÷(
+
)]×1
(5)20
×83+1.7×200
(6)
÷[(
﹣
)÷
].
计算,能简算的要简算:
3×(
+
)﹣
÷
+
×
999×222+333×334
2011×
÷〔
﹣(
﹣
)〕 (4.71÷0.6)×(3
﹣3.375)+2
.





﹣(
÷
﹣
)
(
+
+
)÷
3
×9.7+37.5×0.13﹣15÷4.
+
)÷
] 48×(
﹣
)


.
×
+
÷(
﹣
)×
×[
﹣(
+
)] (80﹣9.8)×0.6﹣2.1 (
﹣
)×45.
×88+
÷
.
+
÷
(2)(
+
)×15 (3)(
﹣
)×(
+
) (4)2﹣
÷
+
.
÷
②
﹣
×
③(
+
)×45 ④
×
)
÷23+
×
⑥
×
+
+
×
÷
×
﹣
×
.
+2.89+
; (2)
﹣
+
﹣
;
﹣
+
; (4)3.25×1.6+1.6×6.75.
+
+
)×28
÷
+
﹣
+
﹚]×
=
=
=
=
+
﹣
)×72 2
+3
﹣3
+1
+1
÷
+
÷[(
+
)×
] 8.3×
+5.7×
.
+
+
﹣
(
+
)×36.
+(
﹣
)]×
÷8+12.5%×
(50%﹣
+
)×12.
÷5) (
+
)×(
﹣
)
×24+
×
+
÷
4﹣
÷
﹣
﹣
﹣
.
)×
÷[
÷(1﹣
)] 4÷
﹣
﹣
﹣
.
﹣
﹣
+
﹣
﹣(
﹣
)
﹣(
﹣
) 8﹣
﹣
+9.37+
+0.63.
÷7+7÷
÷2+3)
×88+
÷
+
)]×
﹣
)
+
+
﹣
﹣
7﹣(
﹣
)
+
+
+
.
+
÷
+
(
+
﹣
)×72
÷
+
×
.
×11+
×
﹣
÷[
×(
﹣
)]
÷(
﹣
)×
98×
(
﹣
)÷﹙
÷
﹚
﹣
)×(
+
) ②
÷7+
×
③2
×
+
÷
④
÷[
×(
+
)]
×
+
×
+
⑦100×
.
(
﹣
)×36 
×
+
÷
2﹣
÷
﹣
.


.
+(
+
)
+
+
+
﹣
﹣
+
+
+
.
﹣(
+
) [1﹣(
+
)]÷
2﹣
÷
﹣
×
+
÷
.
÷9+
×
(2)
﹣
﹣

﹣
)
(4)
.
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