Toán Lớp 6: |x+1/3|÷2=〈-2^4 〉 2/3×〈3×x-2〉+25%×x=-9/6

Question

Toán Lớp 6:  |x+1/3|÷2=〈-2^4 〉   2/3×〈3×x-2〉+25%×x=-9/6

cobelolen · Answer

| x + 1/3 | : 2 = ( - 2 )^4   &hArr; | x + 1/3 | : 2 = 16   &hArr; | x + 1/3 | = 16 xx 2   &hArr; | x + 1/3 | = 32   &hArr;  ( left[  begin{array}{l}x +  frac{1}{3} = 32  x +  frac{1}{3} = - 32 end{array}  right. )    &hArr;  ( left[  begin{array}{l}x =  frac{95}{3}  x =  frac{- 97}{3} end{array}  right. )   Vậy , x &isin; { 95/3 ; ( - 97 )/3 } .    ___________________________________________   | x + 1/3 | : 2 = ( - 2^4 )   &hArr; | x + 1/3 | : 2 = - 16   &hArr; | x + 1/3 | = - 16 xx 2   &hArr; | x + 1/3 | = - 32 ( V&ocirc; l&yacute; )   &hArr; x &isin; &empty;   Vậy , x &isin; &empty; .   ___________________________________________   2/3 xx ( 3 xx x - 2 ) + 25% xx x = ( - 9 )/6   &hArr; 2 xx x - 4/3 + 1/4 xx x = ( - 9 )/6   &hArr; x xx ( 2 + 1/4 ) = ( - 9 )/6 + 4/3   &hArr; x xx 9/4 = ( - 1 )/6   &hArr; x = ( - 1 )/6 : 9/4   &hArr; x = ( - 2 )/27   Vậy , x = ( - 2 )/27 .

giangnguyen33 · Answer

Giải đáp + Lời giải và giải thích chi tiết:   |x+1/3|:2=(-2^4)   => |x+1/3|:2=-16   =>|x+1/3|=-32   V&igrave; |x+1/3|>=0 m&agrave; -32<0   => Kh&ocirc;ng t&igrave;m được gi&aacute; trị của x   2/3*(3x-2)+25%*x=-9/6   =>2x-4/3+25/100x=-9/6   =>2x-4/3+1/4x=-9/6   =>(2+1/4)x-4/3=-9/6   =>9/4x=-9/6+4/3   =>9/4x=-9/6+8/6   =>9/4x=-1/6   =>x=(-1/6):9/4   =>x=(-1/6)*4/9=-2/27.