x:67=90

x    =90x67

x    =6030

Vậy x=6030

k mik nha

x=6030

x : 67 = 90

       x = 90 x 67

       x = 6030

60%của24là:

24:100*60=14.4

90%của210là:

210:100*90=189

= 957960 nha

10644x90=957960

957960

\(12+78+67+54=211\)

12 + 78 + 67 + 54 = 211

k mik nha

211 nha bạn

bằng 100 nha

33 + 67 = 100

Đổi k nhé

ĐA :100

(201-111+29)-(-119+230)

=90+(119-230)

=90+(-111)

=-21

a)(201-111+29)-(-119+230)

=(201-111+29)+119-230

=119+119-230

=8

b)567+[(-99)+41]+(-708)

=567+(-58)+(-708)

=-199

c)[171+(-159)-[-183-(-195)]

=171+(-159)-[-183+195]

=171+(-195)-12

=-36

d)(225+135)+90-[315+(-685)]

=360+90-(-370)

=820

567 +[(-99) + 41]+(-708)

567+ (-58)+(-708)

509+(-708)

-199

A = \(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+......+\frac{109}{110}\)

A = \(1-\frac{1}{2}+1-\frac{1}{6}+1-\frac{1}{12}....+1-\frac{1}{110}\)

A = \(10-\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+....+\frac{1}{110}\right)\)

A = \(10-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{10}-\frac{1}{11}\right)\)

A = \(10-\left(1-\frac{1}{11}\right)\)

A = \(10-\frac{10}{11}\)

A = \(\frac{100}{11}\)

ai giup mk voi!!!! mk can gap

1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 51/72 + 89/90 + 109/110

= 1 - 1/2 + 1 - 1/6 + 1 - 1/12+ ...... +  1- 1/110 

= 10 - ( 1/2 + 1/6 + ........ + 1/110 )

= 10 - ( 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ..... + 1/10 - 1/11 ) 

= 10 - ( 1 - 1/11 )

= 10 - 10/11

= 100/11