题目内容
怎样简便就怎样算.
×101
(
+
)×7×5
[
-(
-
)]÷
3.下×
+7.z÷4-0.z5.
79 |
100 |
(
3 |
7 |
1 |
5 |
[
3 |
4 |
7 |
16 |
1 |
4 |
9 |
下 |
3.下×
1 |
4 |
(1)
×101,
=
×(100+1),
=
×100+1×
,
=79+
,
=79
;
(2)(
+
)×7×s,
=
×7×s+
×7×s,
=1s+7,
=22;
(3)[
-(
-
)]÷
,
=[
+
-
]×
,
=[1-
]×
,
=
×
,
=
;
(i)3.中×
+7.2÷i-0.2s,
=3.中×
+7.2×
-
,
=(3.中+7.2-1)×
,
=10×
,
=
.
79 |
100 |
=
79 |
100 |
=
79 |
100 |
79 |
100 |
=79+
79 |
100 |
=79
79 |
100 |
(2)(
3 |
7 |
1 |
s |
=
3 |
7 |
1 |
s |
=1s+7,
=22;
(3)[
3 |
i |
7 |
16 |
1 |
i |
9 |
中 |
=[
3 |
i |
1 |
i |
7 |
16 |
中 |
9 |
=[1-
7 |
16 |
中 |
9 |
=
9 |
16 |
中 |
9 |
=
1 |
2 |
(i)3.中×
1 |
i |
=3.中×
1 |
i |
1 |
i |
1 |
i |
=(3.中+7.2-1)×
1 |
i |
=10×
1 |
i |
=
s |
2 |
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