b. 0

c. 112

d. 1250

e. -78

f. -67

b) [(24+-67)]-[-67-(-24)]=0
c) 2^3.17-2^3.14=112
d) 26.(-125)-125.(-36)=1250
e) 48-6(12+9)=-78
f) (-67).(1-301)-301.67=-67

9 : 90 = \(\frac{1}{10}\)

97 : 99 \(\frac{97}{99}\)

97 : 67 = \(\frac{97}{67}\)

76 : 67 = \(\frac{76}{67}\)

9 : 90 =\(\frac{1}{10}\)=0,1

97:99=\(\frac{97}{99}\)

97:67=\(\frac{97}{67}=1,447761194\\\)

76:67=\(\frac{79}{67}=1,179104478\)

=???

ok chị

cái nịt

149

149

cảm ơn các bạn đã giải giúp mình nha

= 11.2301587302

thanks

1*0,9+[67-9]

= 1*9/10+58

= 9/10 + 58

= 580/10

k nhes 

1 * 0, 9 + ( 67 - 9 )

= 0,9  +  58 

= 58 , 9

a, A = ( 1/3 + 12/67 + 13/41 ) - ( 79/67 - 28/41 )

A = (\(\frac13\) + \(\frac{12}{67}\) + \(\frac{13}{41}\)) - (\(\frac{79}{67}\) - \(\frac{28}{41}\))

A = \(\frac13\) + \(\frac{12}{67}\) + \(\frac{13}{41}\) - \(\frac{79}{67}\) + \(\frac{28}{41}\)

A = - (\(\frac{79}{67}-\frac{12}{67}\)) + (\(\frac{13}{41}\) + \(\frac{28}{41}\))

A = - 1 + 1 + \(\frac13\)

A = 0 + \(\frac13\)

A = \(\frac13\)

b, B = 3/4×7 + 3/7×10 + 3/10×13 + ......+ 3/73×76

B = \(\frac{3}{4\times7}\) + \(\frac{3}{7\times10}\) + \(\frac{3}{10\times13}\) + ... + \(\frac{3}{73\times76}\)

B = \(\frac14-\frac17\) + \(\frac17-\frac{1}{10}\) + ... + \(\frac{1}{73}-\frac{1}{76}\)

B = \(\frac14\) - \(\frac{1}{76}\)

B = \(\frac{19}{76}-\) \(\frac{1}{76}\)

B = \(\frac{18}{76}\)

B = \(\frac{9}{38}\)

có sai đề không vậy

minh ko co sai de boi vi cai nay minh tu dat ra ma