Question

Punctele m,n,o,p,r,s,t,u;
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Dau coroana!!!

Answer 1

u) pe 256 îl scrii ca 4^4
3x-5>4
3x>9
x>3

Answer 2

m)3x+11<44⇒3x<44-11⇒3x<33⇒x<33/3⇒x<11
n)3+7x≤52⇒7x≤52-7⇒7x≤49⇒x≤49/7⇒x≤7
o)5x-23≥22⇒5x≥22+23⇒5x≥45⇒x≥45/5⇒x≥9
p)6x-18≥72⇒6x≥18+72⇒6x≥90⇒x≥90/6⇒x≥15
r)3ˣ≤81⇒3ˣ≤3⁴⇒x≤4⇒x∈{0.1.2.3.4}
s)10ˣ<100000⇒10ˣ<10⁵⇒x<5⇒x∈{0.1.2.3.4.5}
t)2²ˣ⁺¹≥128⇒2²ˣ⁺¹≥2⁷⇒2x+1≥7⇒2x≥7-1⇒2x≥6⇒x≥6/2⇒x≥3,x∈{0.1.2.3}
u)4³ˣ⁻⁵≥256⇒4³ˣ⁻⁵ ≥4⁴⇒3x-5≥4⇒3x≥5+4⇒3x≥9⇒x≥9/3⇒x≥3,x∈{0.1.2.3}
sucees