问题 解答题
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
)].
答案

(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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