题目内容

脱式计算(能简算的要简算)
(1)
6
7
÷[(
4
7
-
1
2
2
5
]

(2)
14
15
×25%-
11
15
÷4

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19
(1)
6
7
÷[(
4
7
-
1
2
)×
2
5
]
=
6
7
÷[
1
14
×
2
5
]
=
6
7
÷
1
35

=
6
7
×35
=30;

(2)
14
15
×25%-
11
15
÷4
=
14
15
×
1
4
-
11
15
×
1
4

=(
14
15
-
11
15
)×
1
4

=
1
5
×
1
4

=
1
20


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37
=(1.28-0.28)×2.37
=1×2.37
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19

=5+1
=6.
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