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)

2025-03-06 11:19:51
推荐回答(1个)
回答1:

(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.