Question

a*3+b*10+c*10+a*7 biết a+b+c=10

Answer 1

a*3+b*10+c*10+a*7 

=a*(3+7)+b*10+c*10

=a*10+b*10+c*10

=10*(a+b+c)

=10*10

=100

Answer 2

Trả lời:

a * 3 + b * 10 + c * 10 + a * 7 

= a * (3 + 7) + b * 10 + c * 10  

= a * 10 + b * 10 + c * 10 

= 10 * (a + b + c)

Mà a + b + c = 10

=> 10 * (a + b + c) = 10 * 10 = 100

~Study well~

Answer 3

có khó hôm nè :)))

Answer 4

3*3+b*10+c*10+a*7

=a*3+a*7+b*10+c*10

=a*(3+7)+b*10+c*10

=a*10+b*10+c*10

=10*(a+b+c) mà a+b+c=10

=10*10=100

Answer 5

a x 3 + b x 10 + c x 10 +a x 7

=(a x3 +a x 7) +b x10 +c x 10

=a x 10 +b x 10 + c x 10

=10x(a+b+c)

=10 x 10 =100