
计算下面各题,能简便计算的要简便计算.92×54÷92×54; 1021...
计算下面各题,能简便计算的要简便计算.92×54÷92×54;1021÷[56×(1-23)];(68-1718)×117....
计算下面各题,能简便计算的要简便计算.92×54÷92×54; 1021÷[56×(1-23)]; (68-1718)×117.
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(1)
×
÷
×
=
×
×
×
=
=
;
(2)
÷[
×(1-
)]
=
÷[
×
]
=
÷
=
;
(3)(68-
)×
=68×
-
×
=4-
=3
.
9 |
2 |
5 |
4 |
9 |
2 |
5 |
4 |
=
9 |
2 |
5 |
4 |
2 |
9 |
5 |
4 |
=
9×5×2×5 |
2×4×9×4 |
=
25 |
16 |
(2)
10 |
21 |
5 |
6 |
2 |
3 |
=
10 |
21 |
5 |
6 |
1 |
3 |
=
10 |
21 |
5 |
18 |
=
12 |
7 |
(3)(68-
17 |
18 |
1 |
17 |
=68×
1 |
17 |
17 |
18 |
1 |
17 |
=4-
1 |
18 |
=3
17 |
18 |
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