计算,能简算的要简算.
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计算,能简算的要简算.
5 |
17 |
(1)
5
17÷9+
1
9×
12
17
=
1
9×(
5
17+
12
17)
=
1
9×1
=
1
9;
(2)2-
6
13÷
9
26-
2
3
=2-(
4
3+
2
3)
=2-2
=0;
(3)87×
3
86
=86×
3
86+1×
3
86
=3+
3
86
=3
3
86.
5
17÷9+
1
9×
12
17
=
1
9×(
5
17+
12
17)
=
1
9×1
=
1
9;
(2)2-
6
13÷
9
26-
2
3
=2-(
4
3+
2
3)
=2-2
=0;
(3)87×
3
86
=86×
3
86+1×
3
86
=3+
3
86
=3
3
86.