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歡迎您訪問(wèn)數(shù)學(xué)考題練習(xí):已知關(guān)于x、y的方程組的解滿足x+y≥7,那么!

數(shù)學(xué)考題練習(xí):已知關(guān)于x、y的方程組的解滿足x+y≥7,那么

更新時(shí)間:2024-01-12 16:27:30作者:貝語(yǔ)網(wǎng)校

已知關(guān)于x、y的方程組的解滿足x+y≥7,那么k的取值范圍是

A.k≤2

B.k≥2

C.k>2

D.k≥3

試題答案

B

試題解析

先把k當(dāng)作已知表示出x、y的值,再根據(jù)x+y≥7列出不等式,求出k的取值范圍即可.

解答:解方程組得,,

∵x+y≥7,

∴k+2k+1≥7,

解得k≥2.

故選B.

點(diǎn)評(píng):此題主要考查解二元一次方程組的基本方法,解答此題的關(guān)鍵是用k表示出x、y的值,再根據(jù)題意列出不等式.

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