题目内容

简便运算
3
8
×27+27×
5
8

②[2.1-2.1×(2.1-2.1)]÷2.1
3
4
×5+
3
4
×2+
3
4
×3
④4-
4
9
-
5
9
3
8
×27+27×
5
8

=(
3
8
+
5
8
)×27,
=1×27,
=27;

②[2.1-2.1×(2.1-2.1)]÷2.1
=[2.1-2.1×0]÷2.1,
=[2.1-0]÷2.1,
=2.1÷2.1,
=1;

3
4
×5+
3
4
×2+
3
4
×3
=(5+2+3)×
3
4

=10×0.75,
=7.5;

④4-
4
9
-
5
9

=4-(
4
9
+
5
9
),
=4-1,
=3.
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