题目内容

脱式计算(能用简便方法计算的要用简便方法).
17.5-4.25-5.75
1.68÷(2.4×2-4.6)
9
36
÷[
3
4
-(
7
16
-
1
4
)].
(1)17.5-4.25-5.75
=17.5-(4.25+5.75)
=17.5-10
=7.5;

(2)1.68÷(2.4×2-4.6)
=1.68÷(4.8-4.6)
=1.68÷0.2
=8.4;

(3)
9
36
÷[
3
4
-(
7
16
-
1
4
)]
=
9
36
÷[
3
4
-
3
16
]

=
9
36
÷
9
16

=
9
36
×
16
9

=
4
9
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