计算(1)349-(21117-259);(2)(23+79×928)÷1112;(3)123×[756÷(14.625-318)-413].
计算(1)349-(21117-259);(2)(23+79×928)÷1112;(3)123×[756÷(14.625-318)-413]....
计算(1)349-(21117-259);(2)(23+79×928)÷1112;(3)123×[756÷(14.625-318)-413].
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(1)3
-(2
-2
)
=3
+2
-2
=6-2
=3
;
(2)(
+
×
)÷
=(
+
)÷
=
×
=1;
(3)1
×[7
÷(14.625-3
)-4
]
=1
×[7
÷11.5-4
]
=1
×[
×
-4
]
=1
×[
-4
4 |
9 |
11 |
17 |
5 |
9 |
=3
4 |
9 |
5 |
9 |
11 |
17 |
=6-2
11 |
17 |
=3
6 |
17 |
(2)(
2 |
3 |
7 |
9 |
9 |
28 |
11 |
12 |
=(
2 |
3 |
1 |
4 |
11 |
12 |
=
11 |
12 |
12 |
11 |
=1;
(3)1
2 |
3 |
5 |
6 |
1 |
8 |
1 |
3 |
=1
2 |
3 |
5 |
6 |
1 |
3 |
=1
2 |
3 |
47 |
6 |
2 |
23 |
1 |
3 |
=1
2 |
3 |
47 |
69 |