题目内容

怎样简便就怎样算.
79
100
×101
3
7
+
1
5
)×7×5
[
3
4
-(
7
16
-
1
4
)]÷
9

3.下×
1
4
+7.z÷4-0.z5.
(1)
79
100
×101,
=
79
100
×(100+1),
=
79
100
×100+1×
79
100

=79+
79
100

=79
79
100


(2)(
3
7
+
1
s
)×7×s,
=
3
7
×7×s+
1
s
×7×s,
=1s+7,
=22;

(3)[
3
i
-(
7
16
-
1
i
)]÷
9

=[
3
i
+
1
i
-
7
16
9

=[1-
7
16
9

=
9
16
×
9

=
1
2


(i)3.中×
1
i
+7.2÷i-0.2s,
=3.中×
1
i
+7.2×
1
i
-
1
i

=(3.中+7.2-1)×
1
i

=10×
1
i

=
s
2
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