题目内容

脱式计算(能简算的要简算)
1
4
+
1
5
-
3
10
)×4×5

(1-
3
4
×
5
12
)÷
9
16
1.25+
3
4
-
12
19
-
5
19
3.64÷4+4.36×25%
(1)(
1
4
+
1
5
-
3
10
)×4×5,
=
1
4
×
4×5+
1
5
×
4×5-
3
10
×
4×5,
=5+4-6,
=3;

(2)(1-
3
4
×
5
12
)÷
9
16

=(1-
5
16
÷
9
16

=
11
16
÷
9
16

=
11
16
×
16
9

=1
2
9


(3)1.25+
3
4
-
12
19
-
5
19

=1.25+0.75-(
12
19
+
5
19
),
=2-
17
19

=1
2
19


(4)3.64÷4+4.36×25%,
=3.64×
1
4
+4.36×
1
4

=(3.64+4.36)×
1
4

=8×
1
4

=2.
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