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合理、灵活地计算①45×3.5+5.5×80%+0.8②(717×19-717)×1718③156÷[611×(59-14)]④2.35÷[4.75-4.5×(0.2+13)].
题目内容:
合理、灵活地计算
①4 5
×3.5+5.5×80%+0.8
②(7 17
×19-7 17
)×17 18
③15 6
÷[6 11
×(5 9
-1 4
)]
④2.35÷[4.75-4.5×(0.2+1 3
)].优质解答
①4 5
×3.5+5.5×80%+0.8,
=0.8×3.5+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
②(7 17
×19-7 17
)×17 18
,
=[(19-1)×7 17
]×17 18
,
=18×7 17
×17 18
,
=7;
③15 6
÷[6 11
×(5 9
-1 4
)],
=11 6
÷[6 11
×11 36
],
=11 6
÷1 6
,
=11 6
×6,
=11;
④2.35÷[4.75-4.5×(0.2+1 3
)],
=2.35÷[4.75-4.5×(1 5
+1 3
)],
=2.35÷[4.75-4.5×8 15
],
=2.35÷[4.75-2.4],
=2.35÷2.35,
=1.
①
4 |
5 |
②(
7 |
17 |
7 |
17 |
17 |
18 |
③1
5 |
6 |
6 |
11 |
5 |
9 |
1 |
4 |
④2.35÷[4.75-4.5×(0.2+
1 |
3 |
优质解答
4 |
5 |
=0.8×3.5+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
②(
7 |
17 |
7 |
17 |
17 |
18 |
=[(19-1)×
7 |
17 |
17 |
18 |
=18×
7 |
17 |
17 |
18 |
=7;
③1
5 |
6 |
6 |
11 |
5 |
9 |
1 |
4 |
=
11 |
6 |
6 |
11 |
11 |
36 |
=
11 |
6 |
1 |
6 |
=
11 |
6 |
=11;
④2.35÷[4.75-4.5×(0.2+
1 |
3 |
=2.35÷[4.75-4.5×(
1 |
5 |
1 |
3 |
=2.35÷[4.75-4.5×
8 |
15 |
=2.35÷[4.75-2.4],
=2.35÷2.35,
=1.
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