3 运动定律与简便运算
(1)99×6.25+6.25
(2)(5.6×0.3﹣0.68)÷0.25×4
(3)6.9﹣(0.6+4.5)÷1.7
(4)7.2÷1.25÷0.8
(5)(25.5+17.25)÷0.25+0.75
(6)2.63×2.3+2.3+6.37×2.3.
479﹣201
=479﹣
= ,
= ;
25×36
=25× × ,
= ,
= ;
2700÷(27×25),
=2700÷ ,
= ;
= ;
98×47,
=(100 )×47,
=100×47 ×47,
= .
能简算的就简算.
①2.983+0.53+1.25 ②23.75﹣3.625﹣0.375 ③5.1+0.9﹣5.1+0.9
④49.3﹣28.5+20.5 ⑤6.32﹣(5.26﹣3.52) ⑥10.75+0.4+0.25.
用简便方法计算下面各题.
87+124+13+76 487﹣(187+256) 125×48
427×99 254×9﹣54×9 6000÷4÷25.
在□或〇里填上合适的数字或符号.
(1)25×
×
=□×(□×□)
(2)
×
×
=(□×□)×□
(3)
×(15×
)=□×(□×□)
(4)25
×4=□×□+□×□
(5)7×
=□×□〇□×□
(6)1
×25=□×□〇□×□
(7)54×(
﹣
)=□×□〇□×□





×51
×18.
+
)×32 17×
.
×
+
×
+
)×
.


.
×8 
73×
﹣
.
×
×10 6.8×
+
×3.2 (
+
﹣
)×12; 46×
.
+
×
×39×
×
+
×
)×4×5 2005×
24×
+51×
.
)×36 

×
.
+
)
×7+
×5×
﹣
)×
48×
14×
.
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