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□×□
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.
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.
479﹣201
=479﹣
= ,
= ;
25×36
=25× × ,
= ,
= ;
2700÷(27×25),
=2700÷ ,
= ;
= ;
98×47,
=(100 )×47,
=100×47 ×47,
= .
试题篮
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