(-60)+2². { [ (-35)+5³.3]: (-8)-15}

=(−60)+4.{[(−35)+25.3]:(−8)−15}

=(-60)+4.{[(-35)+75]:(-8)-15}

=(−60)+4.[40:(−8)−15]

=(−60)+4.[(−5)−15]

=(−60)+4.(−20)

=(−60)+(−80)

=(−140)

(-60)+2². { [ (-35)+5³.3]: (-8)-15}

=(−60)+4.{[(−35)+25.3]:(−8)−15}

=(-60)+4.{[(-35)+75]:(-8)-15}

=(−60)+4.[40:(−8)−15]

=(−60)+4.[(−5)−15]

=(−60)+4.(−20)

=(−60)+(−80)

=(−140)

(-60) + 2².{[(-35) + 5².3] : (-8) - 15}

= (-60) + 4.{[(-35) + 25.3] : (-8) - 15}

= (-60) + 4.{[(-35) + 75] : (-8) - 15}

= (-60) + 4.{40 : (-8) - 15]

= (-60) + 4.{(-5) - 15}

= (-60) + 4.(-20)

= (-60) + (-80)

= (-140)

viết các phân số sau dưới dạng số thập phân:

35/56 ; 10/15 ; 5/11 ; 2/13 ; 15/82 ; 13/22 ; 1/60 ; 5/24

\(\dfrac{35}{56}=0,625\) , \(\dfrac{10}{15}=0,\left(6\right)7\), \(\dfrac{5}{11}=0,\left(45\right)\), \(\dfrac{2}{13}=0,\left(1538\right)\), \(\dfrac{15}{82}=0,1829...\), \(\dfrac{13}{22}=0,59\left(09\right)\), \(\dfrac{1}{60}=0,01\left(6\right)7\), \(\dfrac{5}{24}=0,208\left(3\right)\)

\(\dfrac{36}{35}=1,0\left(285714\right)\)

\(\dfrac{10}{15}=\dfrac{2}{3}=0,\left(6\right)\)

\(\dfrac{5}{11}=0,\left(45\right)\)

\(\dfrac{2}{13}=0,\left(153846\right)\)

\(\dfrac{15}{82}=0,1\left(82926\right)\)

\(\dfrac{13}{22}=0,5\left(90\right)\)

\(\dfrac{1}{60}=0,01\left(6\right)\)

\(\dfrac{5}{24}=0,208\left(3\right)\)

\(a,8+2\sqrt{15}=\left(\sqrt{3}+\sqrt{5}\right)^2\\ b,12+2\sqrt{35}=\left(\sqrt{7}+\sqrt{5}\right)^2\\ c,8+\sqrt{60}=8+2\sqrt{15}=\left(\sqrt{3}+\sqrt{5}\right)^2\)

`# \text {DNamNgV}`

`16/21 + 6/7`

`= 16/21 + 18/21`

`= 34/21`

__

`15/22 \times 11/35`

`= (15 \times 11)/(22 \times 35)`

`= (5 \times 3 \times 11)/(2 \times 11 \times 5 \times 7)`

`= (3 \times 1)/(2 \times 7)`

`= 3/14`

___

`8/11 \div 5/22`

`= 8/11 \times 22/5`

`= (8 \times 22)/(11 \times 5)`

`= (8 \times 11 \times 2)/(11 \times 5)`

`= (8 \times 2)/5`

`= 16/5`

___

`9/13 \div 27/39`

`= 9/13 \times 39/27`

`= 9/13 \times 13/9`

`= 1`

8/6 = 4/3

12/36 = 1/3

20/35 = 4/7

60/15 = 4

4/3 ; 1/3 ; 4/7 ; 20/3

`A)15/9=(5 xx 3)/(3 xx 3)=5/3`

`60/(-96)=(5 xx 12)/(12 xx (-8))=-5/8`

`=>5/3=15/9`

Ta thấy trừ cặp `5/3=15/9` thì còn lại không bằng nhau.

`B)60/(-85)=(5 xx 12)/(5 xx (-17))=-12/17`

`-77/56=(7 xx (-11))/(8 xx 7)=-11/8`

`=>-12/17=60/(-85)`

Ta thấy trừ cặp `-12/17=60/(-85)` thì còn lại không bằng nhau.

a) \(\dfrac{15}{9}=\dfrac{5}{3}\)

b) \(-\dfrac{12}{17}=\dfrac{60}{-85}\)