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计算(能简便的必须简算)91×117+9÷17−1÷17×1000.38×7−1950+4×19502100÷[56×(37−38)][(23−14)÷56+12]×34.
题目内容:
计算(能简便的必须简算) 91×1 17
+9÷17−1÷17×100 0.38×7−19 50
+4×19 50
2100÷[56×(3 7
−3 8
)] [(2 3
−1 4
)÷5 6
+1 2
]×3 4
.
优质解答
(1)91×1 17
+9÷17−1÷17×100,
=91×1 17
+9×1 17
-1 17
×100,
=(91+9-100)×1 17
,
=0×1 17
,
=0;
(2)0.38×7−19 50
+4×19 50
,
=0.38×7-0.38+4×0.38,
=0.38×(7-1+4),
=0.38×10,
=3.8;
(3)2100÷[56×(3 7
−3 8
)],
=2100÷[56×3 7
-56×3 8
],
=2100÷[24-21],
=2100÷3,
=700;
(4)[(2 3
−1 4
)÷5 6
+1 2
]×3 4
,
=[5 12
÷5 6
+1 2
]×3 4
,
=[5 12
×6 5
+1 2
]×3 4
,
=[1 2
+1 2
]×3 4
,
=1×3 4
,
=3 4
.
91×
| 0.38×7−
| ||||||||||||||
2100÷[56×(
| [(
|
优质解答
(1)91×
1 |
17 |
=91×
1 |
17 |
1 |
17 |
1 |
17 |
=(91+9-100)×
1 |
17 |
=0×
1 |
17 |
=0;
(2)0.38×7−
19 |
50 |
19 |
50 |
=0.38×7-0.38+4×0.38,
=0.38×(7-1+4),
=0.38×10,
=3.8;
(3)2100÷[56×(
3 |
7 |
3 |
8 |
=2100÷[56×
3 |
7 |
3 |
8 |
=2100÷[24-21],
=2100÷3,
=700;
(4)[(
2 |
3 |
1 |
4 |
5 |
6 |
1 |
2 |
3 |
4 |
=[
5 |
12 |
5 |
6 |
1 |
2 |
3 |
4 |
=[
5 |
12 |
6 |
5 |
1 |
2 |
3 |
4 |
=[
1 |
2 |
1 |
2 |
3 |
4 |
=1×
3 |
4 |
=
3 |
4 |
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