lx2+3+lx-3ll=(3-x)2
Vì (3-x)2 lớn hơn hoặc =0
=>x2+3+lx-3l=(3-x)2
=>x2+3+lx-3l=9-6x+x2
=>3+lx-3l=9-6x
=>lx-3l=6-6x
xét x<3:
=>-(x-3)=6-6x
=>-x+3=6-6x
=>6x-x=6-3
=>5x=3
=>x=0,6
xét x>(=)3:
=>x-3=6-6x
=>6x+x=6+3
=>7x=9
=>x=9/7<3 (trái giả thuyết)
vậy x=0,6
bài này tui không biết làm nên tôi hỏi anh tui
xin tự giới thiệu,tui là em gái của Nguyễn Thiều Công Thành
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giúp mik vs nha please
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Trả lời bằng cả tiếng Anh và tiếng Việt các bạn nhé !
giúp với ! *cx ko hiểu quy luật*
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