题目内容

【题目】计算,能简算的要简算。

0.37+5.4+0.63+4.6   68.45+14.6-32.45   36.3-7.6-2.4

13.85-(3.85+9.6)    37.9+(14.62-8.7)    89.49+9.99

【答案】11;50.6;26.3;

0.4;43.82;99.48.

【解析】

0.37+5.4+0.63+4.6

=(0.37+0.63)+(5.4+4.6)

=1+10

=11;

68.45+14.6-32.45

=(68.45-32.45)+14.6

=36+14.6

=50.6;

36.3-7.6-2.4

=36.3-(7.6+2.4)

=36.3-10

=26.3;

13.85-(3.85+9.6)

=13.85-3.85-9.6

=10-9.6

=0.4;

37.9+(14.62-8.7)

=37.9+5.92

=43.82;

89.49+9.99

=89.49+10-0.01

=99.49-0.01

=99.48.

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