问题 解答题
用简便方法计算.
0.6+7.91+3.4+0.09
1
2
×3+
1
2
×8-
1
2
答案

①0.6+7.91+3.4+0.09,

=(0.6+3.4)+(7.91+0.09),

=4+8,

=12;

1
2
×3+
1
2
×8-
1
2

=

1
2
×(3+8-1),

=

1
2
×10,

=5.

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