Issolvi 31/5div8/5*21/10

$$3 \frac { 1 } { 5 } \div \frac { 8 } { 5 } \times 2 \frac { 1 } { 10 }$$

Evalwa

$$\frac{21}{5}=4.2$$

Passi tas-Soluzzjonijiet

Iddividi \frac{3\times 5+1}{5} b'\frac{8}{5} billi timmultiplika \frac{3\times 5+1}{5} bir-reċiproku ta' \frac{8}{5}.

$$\frac{\left(3\times 5+1\right)\times 5}{5\times 8}\times \frac{2\times 10+1}{10}$$

Annulla 5 fin-numeratur u d-denominatur.

$$\frac{1+3\times 5}{8}\times \frac{2\times 10+1}{10}$$

Immultiplika 3 u 5 biex tikseb 15.

$$\frac{1+15}{8}\times \frac{2\times 10+1}{10}$$

Żid 1 u 15 biex tikseb 16.

$$\frac{16}{8}\times \frac{2\times 10+1}{10}$$

Iddividi 16 b'8 biex tikseb2.

$$2\times \frac{2\times 10+1}{10}$$

Immultiplika 2 u 10 biex tikseb 20.

$$2\times \frac{20+1}{10}$$

Żid 20 u 1 biex tikseb 21.

$$2\times \frac{21}{10}$$

Esprimi 2\times \frac{21}{10} bħala frazzjoni waħda.

$$\frac{2\times 21}{10}$$

Immultiplika 2 u 21 biex tikseb 42.

$$\frac{42}{10}$$

Naqqas il-frazzjoni \frac{42}{10} għat-termini l-aktar baxxi billi testratta u tikkanċella barra 2.

$$\frac{21}{5}$$

Fattur

$$\frac{3 \cdot 7}{5} = 4\frac{1}{5} = 4.2$$