sprawdz,czy podana liczba spełnia równanie:
a)5(n+1)-10=3n+1..3
b)2(a+1)-3(a-5)=7a...2
c)3x(x-5)=(x-2)(3x-3)..-1
d)3/5-(7/9-1/4)=2-(x+3)...0
4
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a)
5(n+1)-10=3n+1..3
5(3+1)-10=3*3+1
15+5-10=9+1
10=10
b)
2(a+1)-3(a-5)=7a...2
2(2+1)-3(2-5)=7*2
4+2-6+15=14
15=14