题目内容

【题目】计算下面各题,怎样计算简便就怎样算.

21.8+2.04×8.5

21.21+37.38+9.79+2.62

3.9×7.6+3.9×2.4

102﹣12.2﹣2.8

【答案】39.14;71;39;87

【解析】

21.8+2.04×8.5

=21.8+17.34

=39.14

21.21+37.38+9.79+2.62

=21.21+9.79+(37.38+2.62)

=31+40

=71

3.9×7.6+3.9×2.4

=3.9×(7.6+2.4)

=3.9×10

=39

102﹣12.2﹣2.8

=102﹣(12.2+2.8)

=102﹣15

=87

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