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a=2×(28-2+4), b=a:10, c=(a+b):6 află (a+b+c):11=? ( 2×a+5×b):15=? ​

Răspuns :

Nicoletaalbaipbcp3s

a=2×30=60

b=60:10=6

c=(60+6):6=66:6=11

(60+6+11):11=77:11=7

(2×60+5×6):15=(120+30):15=150:15=10

Marcela16

a =2 ×(28 - 2+4)

a =2 ×(26 +4)

a =2 ×30

a =60

b =a :10

b =60 :10

b =6

c =(a +b) :6

c =(60 +6) :6

c =66 :6

c =11

(a +b +c) :11 =

(60 +6 +11) :11 =

77 :11 =

7

(2×a +5 ×b) :15 =

(2 ×60 +5 ×6) :15 =

(120 +30) :15 =

150 :15 =

10