题目内容
【题目】判断下列计算是否正确，并说说理由.
7.4×4.6+7.4×5.4-7.4 3.6×0.25 8.3×6.2+0.83×38
=7.4×(4.6+5.4) =9×(4×0.25) =8.3×(6.2+3.8)
=7.4×10 =9×1 =8.3×10
=74 =9 =83
【答案】(1)×
7.4×4.6+7.4×5.4-7.4
=7.4×(4.6+5.4) -7.4
=74-7.4
=66.6
(2)×
3.6×0.25
=0.9×(4×0.25)
=0.9×1
=0.9
(3)√
【解析】
略
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