单项选择题
若2m
2
+3m+7的值为8,则4m
2
+6m-9的值为()
A.2
B.-17
C.-7
D.7
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单项选择题
若x=3是方程a-bx=4的解,则-6b+2a+2021值为()
A.2017
B.2027
C.2045
D.2029
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单项选择题
当3≦m< 5时,化简|2m-10|-|m-3|得()
A.13+m
B.13-3m
C.m-3
D.m-13
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