问题 解答题
用递等式计算,怎样简便就怎样算
(1)3.7-2.2+7.3-7.8
(2)375+450÷18×25
(3)2.9×
1
8
+1.1×
1
8

(4)
1
4
÷(
3
4
-
1
2
答案

(1)3.7-2.2+7.3-7.8,

=(3.7+7.3)-(2.2+7.8),

=11-10,

=1;

(2)375+450÷18×25

=375+25×25

=375+625

=1000;

(3)2.9×

1
8
+1.1×
1
8

=(2.9+1.1)×

1
8

=4×

1
8

=

1
2

(4)

1
4
÷(
3
4
-
1
2
),

=

1
4
÷
1
4

=1.

填空题

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