问题:
(19
4
9
+9
4
19
)÷(2
7
9
+1
6
19
)=( )
A.1994
B.94
C.19
D.7
(19
+9
)÷(2
+1
)=( )
4 |
9 |
4 |
19 |
7 |
9 |
6 |
19 |
A.1994 | B.94 | C.19 | D.7 |
参考答案: