a) - 11 + y + 7

= (-11) + 7 + y

= (-4) + y

b) x + 22 + (-11)

= x + 11

c)a + (-15) + 62

= a + 47

a) -11 + y + 7 = y - 4

b) x + 22 + ( -11 ) = x + 11

c) a + ( -15 ) + 62 = a + 47

Tk mk nha bn

Trần Văn Thành:

a) -11 + y + 7           ;   b) x + 22 + (-14)

= (-7) + (-4) + y + 7  ;     = x     +    8

= (-7) + 7 + y + (-4)   ;   c)  a + (-15) + 62

=        0    + (-4) + y   ;   = a + 47

=      (-4) + y

(-11) + y + 7 = (-11) + 7 + y

                    = -4 + y

a)-11+y+7

=y+(-11+7)

=y+(-4)

=y-4

b)x+22+(-14)

=x+22-14

=x+8

c) a+(-15)+62

=a-15+62

=a+47

\(\dfrac{\left(-6\right).11}{\left(-11\right).\left(-8\right)}=\dfrac{\left(-3\right).2.11}{11.2.4}=-\dfrac{3}{4}\)

\(\dfrac{21.\left(-5\right)}{25.\left(-7\right)}=\dfrac{\left(-3\right).\left(-7\right).\left(-5\right)}{\left(-5\right).\left(-5\right).\left(-7\right)}=\dfrac{3}{5}\)

\(\dfrac{32.9.11}{12.24.22}=\dfrac{4.4.2.3.3.11}{3.4.4.2.3.11.2}=\dfrac{4^2.2.3^2.11}{3^2.4^2.2^2.11}=\dfrac{1}{2}\)

\(\dfrac{\left(-6\right).11}{\left(-11\right).\left(-8\right)}\)=\(\dfrac{-3}{4}\)

\(\dfrac{21.\left(-5\right)}{25.\left(-7\right)}\)=\(\dfrac{2}{5}\)

\(\dfrac{32.9.11}{12.24.22}\)=\(\dfrac{1}{2}\)

a, -11 +y+7

=(-11)+7+y

=(-4)+y

b, x+22+(-14)

=x+8

c, a+(-15)+62

=a+47

tick nha lợn ka ka

a)=(-11+7)+y

   =-4+y

b)=x+[22+(-14)]

  =x+8

c)=a+(-15+62)

  =a+47

a)=(-11+7)+y

   =-4+y

b)=x+[22+(-14)]

  =x+8

c)=a+(-15+62)

  =a+47

a)=(-11+7)+y

   =-4+y

b)=x+[22+(-14)]

  =x+8

c)=a+(-15+62)

  =a+47

A=3³=27
\(B=\dfrac{2^{11}.9^2}{3^5.2^8}=\dfrac{2^{11}.3^4}{3^5.2^8}=\dfrac{2^3}{3}=\dfrac{8}{3}\)

A=3^3=9

B=2^3/3^5=8/243

A=3^18:3^15=3^3

B=(2^11.3^4)/(3^5.2^8)

=2^3/3=8/3

Chúc bạn học tốt!

a)-5+y

b)x+7

c)50+a

a) - 5 + y

b) x + 7

c) 50 + a

a, - 11 + y + 7

= - 4 + y

b, x + 22 + (-15)

= x + 7

c, a + (-12) + 62

= a + 50