题目内容

【题目】怎样算简便怎样。

5.02-3.5+0.98 2.88+2.3+4.7 36.78-21.5-13.28

5.74+2.7+2.3 14.7+1.98+0.02+5.3 15.6+2.7-14.6

【答案】2.5;9.88;2;

10.74;22;3.7

【解析】

5.02-3.5+0.98 2.88+2.3+4.7 36.78-21. 5-13.28

=(5.02+0.98)-3.5 =2.88+(2.3+4.7) =36.78-13.28-21.5

=6-3.5 =2.88+7 =23.5-21.5

=2.5 =9.88 =2

5.74+2.7+2.3 14.7+1.98+0.02+5.3 15.6+2.7-14.6

=5.74+(2.7+2.3) =(14.7+5.3)+(1.98+0.02) =15.6-14.6+2.7

=5.74+5      =20+2 =1+2.7

=10.74 =22    =3.7

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