Question

當(dāng)x=4時，4x²+0.2=

1. A.
   12.2
2. B.
   256.2
3. C.
   64.2

Answer 1

C
分析：把x=4的值代入式子4x²+0.2進(jìn)行解答．
解答：當(dāng)x=4時，
4x²+0.2，
=4×4²+0.2，
=4×16+0.2，
=64+0.2，
=64.2．
故選：C．
點評：本題的關(guān)鍵是把x的值代入式子，再進(jìn)行計算．