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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