计算.(1)3.6-[(7.5-5.7)×0.2](2)9÷(12?14+18)?3×7(3)123×(12?13)÷16×3 &n...
计算.(1)3.6-[(7.5-5.7)×0.2](2)9÷(12?14+18)?3×7(3)123×(12?13)÷16×3(4)[845?(0.6+2910)×47]...
计算.(1)3.6-[(7.5-5.7)×0.2](2)9÷(12?14+18)?3×7(3)123×(12?13)÷16×3 (4)[845?(0.6+2910)×47]÷1.7.
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(1)3.6-[(7.5-5.7)×0.2],
=3.6-[1.8×0.2],
=3.6-0.36,
=3.24;
(2)9÷(
?
+
)?3×7,
=9÷
-3×7,
=24-21,
=3;
(3)1
×(
?
)÷
×3,
=
×
÷
×3,
=(
×3)×(
÷
),
=5×1,
=5;
(4)[8
?(0.6+2
)×
]÷1.7,
=[8
?3.5×
]÷1.7,
=[8
?2]÷1.7,
=6.8÷1.7,
=4.
=3.6-[1.8×0.2],
=3.6-0.36,
=3.24;
(2)9÷(
1 |
2 |
1 |
4 |
1 |
8 |
=9÷
3 |
8 |
=24-21,
=3;
(3)1
2 |
3 |
1 |
2 |
1 |
3 |
1 |
6 |
=
5 |
3 |
1 |
6 |
1 |
6 |
=(
5 |
3 |
1 |
6 |
1 |
6 |
=5×1,
=5;
(4)[8
4 |
5 |
9 |
10 |
4 |
7 |
=[8
4 |
5 |
4 |
7 |
=[8
4 |
5 |
=6.8÷1.7,
=4.
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