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Theo bài ra \(\dfrac{2a+b+c+d}{a}=\dfrac{a+2b+c+d}{b}=\dfrac{a+b+2c+d}{c}=\dfrac{a+b+c+2d}{d}\)
\(\Rightarrow\)
\(\dfrac{2a+b+c+d}{a}-1=\dfrac{a+2b+c+d}{b}-1=\dfrac{a+b+2c+d}{c}-1=\dfrac{a+b+c+2d}{d}-1\)\(\Rightarrow\)\(\dfrac{a+b+c+d}{a}=\dfrac{a+b+c+d}{b}=\dfrac{a+b+c+d}{c}=\dfrac{a+b+c+d}{d}\)+)Nếu a+b+c+d=0
\(\Rightarrow\)a=b=c=d
\(\Rightarrow\)M=1+1+1+1=4
+)Nếu a+b+c+d=0
\(\Rightarrow\)\(\left\{{}\begin{matrix}a+b=-\left(c+d\right)\\b+c=-\left(a+d\right)\\c+d=-\left(a+b\right)\\d+a=-\left(b+c\right)\end{matrix}\right.\)
\(\Rightarrow\)M=(-1)+(-1)+(-1)+(-1)=-4
Vậy M=4 hoặc M=-4

Chọn từ có phát âm khác
1) A.convinced B.called C.formed D.controlled
2) A.missed B.washed C.hoped D.removed
Chọn từ có phát âm khác
1) A.convinced B.called C.formed D.controlled
2) A.missed B.washed C.hoped D.removed



/f/ | /v/ |
knife, of, cough, leaf, paragraph, phones, stephen, rough, life, laugh, enough, touch | knives, level, leaves, live, very, conversation, move, lovingly |
Mk nghĩ vậy
/f/:
knife, of, cough, leaf, paragraph, phones, stephen, rough, life, laugh, enough, touch
/v/:
knives, level, leaves, live, very, conversation, move, lovingly

2/(x + 1) = 3/(x + 2)
=> 2(x + 2) = 3(x + 1)
=> 2x + 4 = 3x + 3
=> 2x - 3x = 3 - 4
=> -x = -1
=> x = 1
=sghfdgrẹwnfrdbhsfbrf
ez :))