题目内容

用简便方法计算.
7.26-2.38+12.74-7.62
67÷
4
5
÷12.5
7
13
×
9
17
+
9
17
×
6
13
87×
87
88
51×3.2+32×4.9.
(1)7.26-2.38+12.74-7.62,
=(7.26+12.74)-(2.38+7.62),
=20-10,
=10;

(2)67÷
4
5
÷12.5,
=67÷(
4
5
×
12.5),
=67÷10,
=6.7;

(3)
7
13
×
9
17
+
9
17
×
6
13

=(
7
13
+
6
13
)×
9
17

=1×
9
17

=
9
17


(4)87×
87
88

=(88-1)×
87
88

=88×
87
88
-
87
88

=87-
87
88

=86
1
88


(5)51×3.2+32×4.9,
=51×3.2+3.2×49,
=(51+49)×3.2,
=100×3.2,
=320.
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