若2m=3,2n=2,则2m+2n=( )
A.12 | B.7 | C.6 | D.5 |
计算.(每题4分,共24分)
(1)
(2)
(3)
(4)(-81)
(5)
(6)
计算:
(1)(﹣4)﹣(﹣1)+(﹣6)÷2.
(2)27÷(﹣3)2﹣(﹣)×(﹣8)
计算
(1)
(2)
(3)
(4)
(5)
(6)19×(-12)
试题篮
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