题目内容
【题目】计算下列各题。
(1) (2)
(3) (4)37.9×0.0038+1.21×0.379+6.21×0.159
【答案】(1) (2)32 (3)13.34 (4)1.59
【解析】
(1)
=÷-÷(-)
=×-÷
=×-×
=-
=
(2)
=36×+36×-36×
=21+20-9
=32
(3)
=13×(+)+0.34×(+)
=13×1+0.34×1
=13+0.34
=13.34
(4)37.9×0.0038+1.21×0.379+6.21×0.159
=0.379×0.38+1.21×0.379+6.21×0.159
=0.379×(0.38+1.21) +6.21×0.159
=0.379×1.59 +6.21×0.159
=0.379×1.59 +0.621×1.59
=1.59×(0.379+0.621)
=1.59×1
=1.59
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