(1). (?112+34+16)×12 (2).?89?2÷3×13 (3).?14?(?2)2×(?3)3÷(?112)2(4)...

2024-12-03 19:13:38
推荐回答(1个)
回答1:

(1)(?

1
12
+
3
4
+
1
6
)×12 
=-
1
12
×12+
3
4
×12+
1
6
×12
=-1+9+2
=10;
(2)?
8
9
?2÷3×
1
3

=-
8
9
-2×
1
3
×
1
3

=-
8
9
-
2
9

=-
10
9

(3)?14?(?2)2×(?3)3÷(?1
1
2
)
2

=-1-4×(-27)÷
9
4

=-1-4×(-27)×
4
9

=-1-(-48)
=-1+48
=-47;
(4)2(3x-2x2y)-3(x-3x2y)
=6x-4x2y-3x+9x2y
=3x+5x2y;
(5)3a2-[8a-(4a-7)-2a2]
=3a2-[8a-4a+7-2a2]
=3a2-8a+4a-7+2a2
=5a2-4a-7;
(6)?2(x?
1
2
)?3(1?
2
3
x)

=-2x+1-3+2x
=-2.