=16 ak

=16 đúng ko bn

Trả lời :

8 : 2 x (2+2) =  16

Học tốt ạ

\(\frac{7}{8}\)- y = \(\frac{1}{2}\)+ \(\frac{1}{8}\)

\(\frac{7}{8}\)- y = \(\frac{5}{8}\)

          y = \(\frac{7}{8}\)- \(\frac{5}{8}\)

          y = \(\frac{1}{4}\)

\(\frac{7}{8}-y=\frac{1}{2}+\frac{1}{8}\)

\(\Rightarrow\frac{7}{8}-y=\frac{5}{8}\)

\(\Rightarrow y=\frac{7}{8}-\frac{5}{8}=\frac{2}{8}=\frac{1}{4}\)

Vậy \(y=\frac{1}{4}\)

1/4 nha,kaito kid

=6,75 giờ +11,2 giờ + 16,8 giờ - 9,8 giờ

=24,95 giờ

32 : 8 = 4
4 x 6 = 24

32 : 8 = 4

4 x 6 = 24

32 : 8 = 4

4 x 6 = 24

=>n+8 chia hết cho n+7

=>n +7+1 chia hết cho n+7,mà n+7 chia hết cho n+7

=>1 chia hết cho n+7

rồi tự tính nha

n = -1

chúc học tốt

\(\text{437.253+466.437+437.281=}\)

\(=437.\left(253+466+281\right)\)

\(=437.\)\(1000\)

\(=437000\)

~ hok tốt ~ 

bằng 437000

TL :

437 000

_HT_

\(\dfrac{7}{19}x\dfrac{8}{23}+\dfrac{7}{19}x\dfrac{15}{23}+1\dfrac{7}{19}\)

= \(\dfrac{7}{19}x\left(\dfrac{8}{23}+\dfrac{15}{23}\right)+1+\dfrac{7}{19}\)

=\(\dfrac{7}{19}x1+1+\dfrac{7}{19}\)

= \(\dfrac{7}{19}+1+\dfrac{7}{19}=1\dfrac{14}{19}\) = \(\dfrac{33}{19}\)

\(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{3}{21}-\dfrac{17}{32}\)

=  \(\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{1}{7}-\dfrac{17}{32}\)

= \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{49}{32}-\dfrac{17}{32}\right)\)

= 1 + 1 + 1 = 3

\(\dfrac{8}{9}x\dfrac{15}{16}x\dfrac{24}{25}x\dfrac{35}{36}x\dfrac{48}{49}x\dfrac{63}{64}\)

= \(\dfrac{3}{4}\) *Câu này bạn tự sử dụng gạch nhé!

`1,`

`a,`

`7/19 \times 8/23 + 7/19 \times 15/23 + 1 7/19`

`= 7/19 \times 8/23 + 7/19 \times 15/23 + 1 + 7/19`

`= 7/19 \times (8/23 + 15/23 + 1) + 1`

`= 7/19 \times 2 + 1`

`=14/19 + 1`

`= 33/19`

`b,`

`75/100 + 18/21 + 49/32 + 1/4 + 3/21 - 17/32`

`= 75/100 + (18/21 + 3/21) + (49/32 - 17/32) + 1/4`

`= 0,75 + 1 + 1 + 0,25`

`= (0,75 + 0,25) + 1 + 1`

`= 1+1+1=3`

`c,`

`8/9 \times 15/16 \times 24/25 \times 35/36 \times 48/49 \times 63/64`

`=` \(\dfrac{2\times3}{3\times3}\times\dfrac{3\times5}{4\times4}\times\dfrac{3\times4\times2}{5\times5}\times\dfrac{5\times7}{6\times6}\times\dfrac{6\times8}{7\times7}\times\dfrac{7\times9}{8\times8}\)

`= 3/4` (bạn sử dụng gạch, rút gọn các số là được nhé).

2/3+ 1/5.10/7 =20/21

Giải :

\(\frac{\text{2}}{\text{3}}+\frac{\text{1}}{\text{5}}.\frac{\text{10}}{\text{7}}\)

\(=\frac{\text{2}}{\text{3}}+\frac{\text{2}}{\text{7}}=\frac{\text{20}}{\text{21}}\)

8+(x-9) = 8+x-9 = 125-64

  =>      8+x       = 70

  =>          x       = 70 - 8

  =>          x        = 62

 Vậy x = 62

bt lm r thì đừng hỏi!

8+ (x-9) = 125 - 64

8 + (x-9) = 61

x-9 = 61 - 8

x - 9 = 53

x = 53 + 9

x = 62