(-25)-(-12)= - 13

18+(14-42)=18+(-28) = -10

(-18)-13+17=(-31) +17= -14

\(\rightarrow\)-13 < -10 > -14\(\Rightarrow\) (-25)-(-12) < 18+(14-42) > (-18)-13+17

 x2-2x+5

=x2-2x+1+4

=(x-1)2+4

Vì: ${}^{}\ge 0\Rightarrow {}^{}+4\ge 4$

Min = 4 khi x=1

[(2⁵ : 2 - 2² x 2²) x 9999] + 10000

= [(2⁴ - 2⁴) x 9999] + 1000

= (0 x 9999) + 10000

= 0 + 10000

= 10000

ỦNg hộ mk nha ^_-

mk mới lp 6

\(\left|a\right|=1,5\Rightarrow\orbr{\begin{cases}a=1,5\\a=-1,5\end{cases}}\)

\(Th1:a=1,5;b=-0,75\)hay \(a=\frac{3}{2};b=\frac{-3}{4}\)

\(\Rightarrow M=\frac{3}{2}+2.\frac{3}{2}.\frac{-3}{4}-\frac{-3}{4}\)

\(=\frac{6}{4}+\frac{-9}{4}+\frac{3}{4}=0\)

\(Th2:a=-1,5;b=0,75\)hay \(a=\frac{-3}{2};b=\frac{-3}{4}\)

​\(\Rightarrow M=\frac{-3}{2}+2.\frac{-3}{2}.\frac{-3}{4}-\frac{-3}{4}\)​

\(=\frac{-6}{4}+\frac{9}{4}+\frac{3}{4}=\frac{3}{2}\)

Vì |a| = 1,5

\(\Rightarrow\orbr{\begin{cases}a=1,5\\a=-1,5\end{cases}}\)

Thay a;b vào M ta có :

\(\orbr{\begin{cases}M=1,5+2.\left(1,5\right).\left(-0,75\right)+0,75\\M=-1,5+2.\left(-1,5\right).\left(-0,75\right)+0,75\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=1,5+3.\frac{-3}{4}+0,75\\M=-1,5+2.\left(1,5\right).\left(0,75\right)+0,75\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=1,5-2,25+0,75\\M=-1,5+3.\frac{3}{4}+0,75\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=1,5-\left(2,25+0,75\right)\\M=-1,5+2,25+0,75\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=1,5-3\\M=-1,5+\left(2,25+0,75\right)\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=-1,5\\M=-1,5+3\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}M=-1,5\\M=1,5\end{cases}}\)

Vậy M = -1,5 hoặc M = 1,5

a) = (68+32)² = 10⁴

b) = (x+1)² - y² = (x+1-y)(x+1+y)

thay vào mà tính

\(=3x^4+3x^2y^2+2x^2y^2+2y^4+2y^2\)

\(=\left(3x^2+2y^2\right)\left(x^2+y^2\right)+2y^2\)

\(=3x^2+2y^2+2y^2\)

\(=3x^2+4y^2\)

A = lẻ - lẻ  = chẵn chia hết cho 2

=> A là hợp số

\(A=25.\left(4-300\right)=-700\)

\(B=83.35-35.183=48,167\)

nhung ban co the giai ra lun ko

A=25\(\times\)(-296)

A= -3400

B=\(35\times\left(183-83\right)\)

B=\(35\times100\)

B=3500