Question

eX :3 SI 5,DAU 100 DE PUNCTE +COROANA!!

Answer 1

ex.3
27=3³
9=3²
729=3⁶
243=3⁵
rezulta 3^(3·6x)+3^(2·9x)+3^(6·3x)=3^(5·11)
3^18x+3^18x+3^18x=3⁵⁵
3^18x(1+1+1)=3⁵⁵
3^18x·3=3⁵⁵
3^18x=3⁵⁵:3
3^18x=3⁵⁵⁻¹
3^18x=3⁵⁴
18x=54
x=54/18
x=3

problema 5
AD este inaltime 
laturile triunghiului sunt: a=28
b=30 
c=26
p este semiperimetrul
p=(a+b+c)/2=(28+30+26)/2=84/2=42cm
folosim formula lui Heron
A=√p(p-a)(p-b)(p-c)
A=√42(42-28)(42-30)(42-26)=√(42x14x12x16)=√112896=336cm²
A=336cm²
A=(BCxAD)/2
BCxAD=2A
AD=2A/BC=(2x336)/28=24cm
AD=24cm

Answer 2

3. puctul c
5.A=√p(p-a)(p-b)(p-c)
A=√42(42-28)(42-30)(42-26)
A=√(42x14x12x16)
A=√112896
A=336cm²
A=(BCxAD)/2
336=28xAD/2
28AD=672
AD=24cm