Question

Calculează în două moduri: a)4/5•(3/8+7/8);
​b)3/7•(2/15-1/10);
​c)3/19•3/7+3/19•4/7;
d)10•7/11+10•3/22+10•1/2.​

Answer 1

Explicație pas cu pas:

a)4/5•(3/8+7/8)=

=4/5•5/4= 1

b) 3/7•(2/15-1/10)

=3/7•1/30=

=1/7•1/10=1/70=70

c) 3/19•3/7+3/19•4/7=

=9/133+12/133

=3/19

d) 10•7/11+10•3/22+10•1/2=

=70/11+5•3/11+5=

=70/11+15/11+5=140/11