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SandyBelluser (0)

Pe: 7 ianuarie 20212021-01-07T21:08:01+02:00 2021-01-07T21:08:01+02:00In: MatematicaIn: Clasele V-VIII

Raspunde

tata nelu · Answer 1 · 2021-01-09T13:33:31+02:00

tata nelu

20/3-21/9=20/3-7/3=13/3

Menim · Answer 2 · 2021-01-09T16:09:02+02:00

Menim maestru (V)

Raspuns editat.

3.a) $\frac{20}3-\frac{21}9=\frac{20}3-\frac73=\frac{13}3$

b) $\frac{21}5-\frac{27}{15}=\frac{21}5-\frac{9}5=\frac{12}5$

c) $\frac{30}7-\frac{36}{42}=\frac{30}{7}-\frac67=\frac{24}7$

d) $\frac{42}6-\frac{35}{30}=\frac{42}6-\frac76=\frac{35}6$

e) $\frac{31}8-\frac{15}{40}=\frac{31}8-\frac38=\frac{28}8=\frac72$

f) $\frac{25}9-\frac{28}{63}=\frac{25}9-\frac49=\frac{21}9=\frac73$

4.a) $\frac{35}8-\frac{20}{32}-\frac38=\frac{35}8-\frac58-\frac38=\frac{27}8$

b) $\frac{32}{15}-\frac{28}{60}-\frac4{15}=\frac{32}{15}-\frac{7}{15}-\frac4{15}=\frac{21}{15}=\frac75$

c) $\frac{41}{18}-\frac7{18}-\frac{39}{54}=\frac{41}{18}-\frac7{18}-\frac{13}{18}=\frac{21}{18}=\frac76$

d) $\frac{53}{12}-\frac7{12}-\frac{49}{84}=\frac{53}{12}-\frac7{12}-\frac{7}{12}=\frac{39}{12}=\frac{13}{4}$

5.a) $2+\frac1{10}-\frac{45}{50}-\frac7{10}=\frac{20}{10}+\frac1{10}-\frac{9}{10}-\frac7{10}=\frac5{10}=\frac12$

b) $1+\frac{11}{24}-\frac{19}{24}-\frac{30}{72}=\frac{24}{24}+\frac{11}{24}-\frac{19}{24}-\frac{10}{24}=\frac{6}{24}=\frac16$

c) $1+\frac7{30}-\frac{19}{30}-\frac{16}{30}=\frac{30}{30}+\frac7{30}-\frac{19}{30}-\frac{16}{30}=\frac2{30}=\frac1{15}$