\(\left(x-2011\right)\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\cdot\frac{2}{9}=\frac{16}{9}\)

\(x-2011=8\)

\(x=2019\)

\(\frac{x-2011}{12}+\frac{x-2011}{20}+\frac{x-2011}{30}+\frac{x-2011}{42}+\frac{x-2011}{56}+\frac{x-2011}{72}=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{8}-\frac{1}{9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3}-\frac{1}{9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\frac{2}{9}=\frac{16}{9}\)

\(x-2011=8\Rightarrow x=2019\)

551 k mình nha goodgirl

2 + 56 + 7 + 8 + 9 + 34 + 90 + 345 = 551

2+56+7+8+9+34+90+345=551

Chúc bạn học giỏi nha!!!

K cho mik vs nhé Goodgirl

\(56\times48+51\times56+56\)
\(=56\times48+51\times56+56\times1\)
\(=56\times\left(48+51+1\right)\)
\(=56\times100\)
\(=5600\)
#kễnh

36 / 4 = 9

12 x 4 = 48

56 / 8 = 7

8 x 9 = 72

36 / 6 =6

9

48

7

72

6

tích mk nha mk trước

9

48

7

72

6

Trả lời

1+1-6+45+456+23-578-45+754+56-557

= 150

hok tốt .

1+1-6+45+456+23-578-45+754+56-557 =150

sẽ bằng 150 bạn nhé 

k mình nha bạn

1+1-6+45+456+23-578-45+754+56-557

=  (456-6) + (45-45) + 1+1+23+754+56 - 578-557

= 450 + 1+1+23+754+56-578-557

= 150

=-71 nhé

x : 56 = 87 - 56

x : 56 = 42

      x = 42 . 56

      x = 2356

k nhá

x:56=87-45

x:56=42

x=42.56

x=2352

k mk nhe

x : 56 = 87 - 45 

x ; 56 = 42

x        = 42 .56 

x        =2352

abc = 250 bạn nhé đúng 100% luôn 

Hiệu số phần bằng nhau là:

9 - 1 = 8 phần

Số đó là:

2000 : 8 = 250 

Đáp số: 250

   k nha

2abc=9*abc

2abc=2000+abc

9*abc=2000+abc

(9-1)*abc=2abc-abc

8*abc=2000

abc=2000:8

abc=250

a=32 x 56 x 34-35 x 11

a=1792 x 34-385

a=60928-385

a=60543

a=32x56x34-35x11

a=1792x34-35x11

a=60928-385

a=60543

a=60 543