Question

Va rog e urgent dau coroana
Exercitiul 3

Answer 1

a) 2,5 × 0,(4)=25/10 × 4/9=5/2×4/9=10/9=1,(1)
b)0,1(6) × 2,4=(16-1)/90× 24/10 =15/90×12/5=1/6×12/5=2/5 =0,4
c) 1 2/3 × 2 1/5 = 5/3 × 7/5 =7/3=2,(3)
d) 1,2 ×3 1/3=12/10×10/3=4
e)0,75×1 2/3× 0,2=75/100×5/3× 2/10=3/4×5/3× 1/5=1/4
f) 0,25×15/27× 4 1/2=1/4×5/9× 9/2=5/8=0,625

Answer 2

a) 2,5 × 0.(4)=$\frac{5}{9}$·$\frac{4}{9}$=$\frac{5}{2}$·$\frac{4}{9}$=$\frac{10}{9}$=1,(1)
b)0,1(6) · 2,4=(16-1)/90· $\frac{20}{10}$ =$\frac{15}{90}$·12/5=$\frac{1}{6}$·$\frac{12}{5}$=$\frac{2}{5 }$ =0,4
c) 1 $\frac{2}{3}$ · 2 $\frac{1}{5}$ = $\frac{5}{3}$ · $\frac{7}{5}$ =$\frac{7}{3}$=2,(3)
d) 1,2 ·3 $\frac{1}{3}$=$\frac{12}{10}$·$\frac{10}{3}$=4
e)0,75·1 2/3· 0,2=75/100·5/3· 2/10=3/4·5/3·1/5=1/4
f) 0,25·15/27·4 1/2=1/4·5/9·9/2=5/8=0,625