Question

Am nevoie rapid ca urmeaza sa vina ora si asta e ca tema​

Answer 1

Răspuns:

1a) 2+4+6+...+26=2(1+2+3+...13)=2*13*14/2=13*14=182

b)$[(3^{3})^{2}:3^{6} +(2^{4} *2^{5}):2^{6}]*9+(35^{2})^{a} =\\ (3^{6}:3^{6}+2^{7}:2^{6})*9+(35^{2})^{a} = \\(1+2)*9+(35^{2})^{a}=27+(35^{2})^{a}$

c) $(1\frac{1}{26} *\frac{13}{45} +1\frac{1}{21}:1\frac{27}{28})*2\frac{2}{15} =\\=(\frac{27}{26} *\frac{13}{45} +\frac{22}{21}:\frac{55}{28} )*\frac{32}{15} =\\=(\frac{3}{2} *\frac{1}{5} +\frac{22}{21}*\frac{28}{55} )*\frac{32}{15} =\\\\=(\frac{3}{10} +\frac{2}{3}*\frac{4}{5} )*\frac{32}{15} = \\=(\frac{3}{10} +\frac{8}{15})*\frac{32}{15} =\\=(\frac{9}{30} +\frac{16}{30})*\frac{32}{15} =\frac{25}{30}*\frac{32}{15} = \\ \frac{25}{30}*\frac{32}{15} =\\\frac{1}{3}*\frac{16}{3} =\\\frac{16}{9}$

III. 1. 4c+7s=71

5c+3s=37 ⇒c=$\frac{37-3s}{5}$

4$\frac{37-3s}{5}$+7s=71 / *5

4(37-3s)+35s=355

148-12s+35s=355

23s=355-148

23s=207⇒s=7

4c+7*7=71

4c=71-49

4c=22 ⇒ c=2,50

2.  (a+b+c):3=14.59

(a+b+7.25):3=14.59 / *3

a+b=14.59*3

a+b=43.77 ⇒(a+b)/2=21.885

3. L=36 ; l=3*L:4

l=3*36:4=27

P=2(L+l)=2(36+27)=2*63=126 cm

A=L*l=36*27=972$cm^{2}$

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