计算下面各题,能简便的要简便计算,并写出必要的过程. (上-12)÷(12+2) 9-(112+18)×22

2025-02-28 06:57:24
推荐回答(1个)
回答1:

(1)(3-
1
2
)÷(
1
4
+2),
=
3
2
÷
9
4

=1
1
9


(2)9-(
1
12
+
1
)×24,
=9-(
1
12
×24+
1
×24),
=9-(2+3),
=9-3,
=4;

(3)(2-2×
2
3
)÷
2
9

=(2-
4
3
÷
2
9

=
2
3
÷
2
9

=3;

(4)
4
9
×13+
3
9
÷
1
13

=(
4
9
+
3
9
)×13,
=1×13,
=13.