Question

punctul 17 va rog mult

Answer 1

a) 3ˣ=81
81:3=27; 27:3=9; 9:3=3; 3:3=1=>x=4
b) 6ˣ=216
216:6=36; 36:6=6; 6:6=1;=>x=3
c)4ˣ=64
64:4=16; 16:4=4; 4:4=1=>x=3
d)3ˣ<3³=>x<3
x∈{0,1,2}
e)5³>=5ˣ=> 3>=x
x∈{0,1,2,3}
f)4ˣ⁺²<=4⁴=>x+2<=4=>x<=2
x∈{0,1,2}
g)7ˣ<100
7⁰=1<100
7¹=7<100
7²=49<100
7³=343>100
x∈{0,1,2}
h) 20>=2ˣ
2⁰=1<=20
2¹=2<=20
2²=4<=20
2³=8<=20
2⁴=16<=20
2⁵=32>20
x∈{0,1,2,3,4}