题目内容

脱式计算.
300-64×84÷28
4-1÷3-
1
3
×8
(2
4
5
+0.6÷
6
35
)×2.4
[1
1
8
-(
13
20
+0.35)÷1
1
7
]×3.2.
(1)300-64×84÷28,
=300-5276÷28,
=300-192,
=108;

(2)4-1÷3-
1
3
×8,
=4-
1
3
-
8
3

=4-(
1
3
+
8
3
),
=4-3,
=1;

(3)(2
4
5
+0.6÷
6
35
)×2.4,
=(2
4
5
+
7
2
)×2.4,
=6.3×2.4,
=15.12;

(4)[1
1
8
-(
13
20
+0.35)÷1
1
7
]×3.2,
=[1
1
8
-1÷1
1
7
]×3.2,
=[1
1
8
-
7
8
]×3.2,
=
2
8
×3.2,
=0.8.
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