>
数学
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代数式y
2
+2y+7的值是6,则4y
2
+8y-5的值是( )
A. 9
B. -9
C. 18
D. -18
人气:462 ℃ 时间:2019-08-19 16:43:22
解答
∵代数式y
2
+2y+7的值是6;
∴y
2
+2y+7=6;
∴y
2
+2y=-1;
∴4y
2
+8y-5=4(y
2
+2y)-5=4×(-1)-5=-9.
故选B.
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