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歡迎您訪問數學考題練習:解不等式2(x-5)-3(4x+6)>0,開始!

數學考題練習:解不等式2(x-5)-3(4x+6)>0,開始

更新時間:2024-01-12 16:35:05作者:貝語網校

解不等式2(x-5)-3(4x+6)>0,開始出現錯誤的步驟是

A.2x-10-12x+18>0

B.2x-12x>18+10

C.-10x>28

D.x<

試題答案

A

試題解析

根據解不等式的步驟檢查則可.

解答:2(x-5)-3(4x+6)>0,

去括號2x-10-12x-18>0,

A選項是2x-10-12x+18>0,在去括號時,18的符號沒有改變.

故選A.

點評:本題考查了不等式的解法,解答這類題學生往往在解題時不注意去括號時符號的變化這一點而出錯.

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