看谁算得又对又快.
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(1)2.5×(6.2-2.6)×0.4
=2.5×3.6×0.4
=(2.5×0.4)×3.6
=1×3.6
=3.6;
(2)[3.61÷(7.2-5.3)]×30
=[3.61÷1.9]×30
=1.71×30
=51.3;
(3)26.7-0.5×0.5-0.75
=26.7-0.25-0.75
=26.7-(0.25+0.75)
=26.7-1
=25.7;
(4)[2-(0.65+0.55)]÷40
=[2-1.2]÷40
=0.8÷40
=0.02.
看谁算得又对又快.
|
(1)2.5×(6.2-2.6)×0.4
=2.5×3.6×0.4
=(2.5×0.4)×3.6
=1×3.6
=3.6;
(2)[3.61÷(7.2-5.3)]×30
=[3.61÷1.9]×30
=1.71×30
=51.3;
(3)26.7-0.5×0.5-0.75
=26.7-0.25-0.75
=26.7-(0.25+0.75)
=26.7-1
=25.7;
(4)[2-(0.65+0.55)]÷40
=[2-1.2]÷40
=0.8÷40
=0.02.