计算:(1)22?1+18?412(2)(548?627+415)÷3(3)(6x4?2x1x)÷3x(4)18+(2+1)?1+(?2)?

2025-12-18 01:50:48
推荐回答(1个)
回答1:

(1)原式=2(

2
+1)+3
2
-2
2
=3
2
+2;

(2)原式=(20
3
-18
3
+4
15
)÷
3

=20-18+4
5

=2+4
5


(3)原式=(3
x
-2
x
)÷3
x

=
x
÷3
x

=
1
3


(4)原式=3
2
+
2
-1+
1
4
=4
2
-
3
4