If x and k are integers and (12x)(42x+1) = (2k)(32), what is the value of k?
A. 5
B. 7
C. 10
D. 12
E. 14
K是怎末求出来的呀?谢谢帮助:-)
等式左边划成: (22x3x)(22(2x+1)) =>(26x+2) (3x)=> 6x+2=K, 试算: x=1,2...
得x=2, k=14, 选E
不知对否?
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