题目内容

计算题.
(1)37.5%×40+
3
8
×40
(2)
2
5
×22%+0.78×40%
(3)
12
25
÷17+
13
25
×
1
17
(4)4.5÷[(10-2.5)×2].
(1)37.5%×40+
3
8
×40,
=(37.5%+
3
8
)×40,
=0.75×40,
=30;

(2)
2
5
×22%+0.78×40%,
=0.4×22%+0.78×0.4,
=0.4×(22%+0.78),
=0.4×1,
=0.4;

(3)
12
25
÷17+
13
25
×
1
17

=
12
25
×
1
17
+
13
25
×
1
17

=(
12
25
+
13
25
)×
1
17

=1×
1
17

=
1
17


(4)4.5÷[(10-2.5)×2],
=4.5÷[7.5×2],
=4.5÷15,
=0.3.
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