问题 解答题
简算.
13.6-2.8+7.4-7.2
98×2.5
8
17
÷23+
1
23
×
9
17

3.5÷8÷0.125.
答案

(1)13.6-2.8+7.4-7.2,

=13.6+7.4-(2.8+7.2),

=21-10,

=11;

(2)98×2.5,

=(100-2)×2.5,

=250-5,

=245;

(3)

8
17
÷23+
1
23
×
9
17

=

8
17
×
1
23
+
1
23
×
9
17

=

1
23
×(
9
17
+
8
17
),

=

1
23
×1,

=

1
23

(4)3.5÷8÷0.125,

=3.5÷(8×0.125),

=3.5÷1,

=3.5.

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