Răspuns:
f) 9⁴¹(9²-9¹-1)=71·3ˣ
9⁴¹(81-9-1)=71·3ˣ
9⁴¹·71=71·3ˣ
(3²)⁴¹·71:71=3ˣ
3⁸²=3ˣ=>x=82
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g) 4ˣ(4²+4¹+1)=336
4ˣ(16+4+1)=336
4ˣ·21=336
4ˣ=336:21
4ˣ=16
4ˣ=4²=>x=2
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h) 3ˣ·4ˣ(3³·4¹-5·1)=1236
3ˣ4ˣ(27·4-5)=1236
3ˣ4ˣ·103=1236
3ˣ4ˣ=1236:103
3ˣ4ˣ=12
3ˣ4ˣ=3¹·4¹=>x=1
