6 miền

k mình

nha

đúng

\(C=-\left(\frac{3}{7}+\frac{3}{8}\right)-\left(-\frac{3}{8}+\frac{4}{7}\right).\)

\(C=-\frac{45}{56}-\frac{11}{56}\)

\(C=-1\)

\(C=-\left(\frac{3}{7}+\frac{3}{8}\right)-\left(-\frac{3}{8}+\frac{4}{7}\right)\)

\(C=-\frac{3}{7}-\frac{3}{8}+\frac{3}{8}-\frac{4}{7}\)

\(C=-\frac{3}{7}-\frac{4}{7}\)

\(C=-\frac{7}{7}=-1\)

F = x⁴ - 2x² + 3 = x⁴ - 2x² + 1 + 2 = (x² - 1)² + 2 \(\ge2\)

=> Min F = 2

Dấu "=" xảy ra <=> x² - 1 = 0

<=> x = \(\pm1\)

Vậy Min F = 2 <=> x = \(\pm1\)

Ta có G = (x² + 2)² - 3 

= x⁴ + 4x² + 1 = x²(x² + 4) + 1 \(\ge1\)

=> Min G = 1

Dấu "=" xảy ra <=> x²(x² + 4) = 0 

<=> x = 0

Vậy Min G = 1 <=> x = 0

dạng 3 ko cần làm

234-567+234= -99

hok tốt nhé

a, 1,5 +|2x - 2/3| = 3/2

            |2x - 2/3| = 3/2 - 1,5 

            |2x - 2/3| = 0

<=> 2x - 2/3 = 0 

<=> 2x = 0 + 2/3

<=> 2x = 2/3

<=> x = 2/3 : 2

<=> x = 1/3 

Vậy x = 1/3

b, 3/4 - |1/4 - x| = 5/8

            |1/4 - x| = 3/4 - 5/8

            |1/4 - x| = 1/8

<=> 1/4 - x = 1/8

       1/4 - x = /1/8

<=> x = 1/4 - 1/8

       x = 1/4 - ( -1/8)

<=> x = 1/8

       x = 3/8

Vậy x thuộc { 1/8 ; 3/8 }

=1/1-7-1/-5+1/2

=1/-2+1/2

=1

k nha đúng

\(\frac{1}{1-3}-\frac{1}{3-5}+\frac{1}{7-5}\)

\(=\frac{1}{-2}-\frac{1}{-2}+\frac{1}{2}\)

\(=\frac{-1}{2}+\frac{1}{2}+\frac{1}{2}\)

\(=0+\frac{1}{2}=\frac{1}{2}\)