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.
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□×□