问题
解答题
若不等式组
|
答案
∵不等式组
有解，1＜x≤2 x＞k
∴k＜2；
，3x+2y=p+1① 4x+3y=p-1②
①×4-②×3得8y-9y=4p+4-3p+3，
解得y=-p-7，
①×3-②×2得9x-8x=3p+3-2p+2，
解得x=p+5，
∴方程组的解为
，x=p+5 y=-p-7
∵x＞y，
∴p+5＞-p-7，
∴p＞-6．
搜题请搜索小程序“爱下问搜题”
若不等式组
|
∵不等式组
有解，1＜x≤2 x＞k
∴k＜2；
，3x+2y=p+1① 4x+3y=p-1②
①×4-②×3得8y-9y=4p+4-3p+3，
解得y=-p-7，
①×3-②×2得9x-8x=3p+3-2p+2，
解得x=p+5，
∴方程组的解为
，x=p+5 y=-p-7
∵x＞y，
∴p+5＞-p-7，
∴p＞-6．
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C．our D，your |