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Question

giaỉ giúp mình  câu này với Tìm n khác 0b) n mũ 35 : n mũ 32 =64c)49.7 mũ 2n+3= 2401*343

Minh · Accepted Answer

b) Ta có :n35 : n32 = 64n3 = 6443 = 64=> n = 4Câu trả lời: b) Ta có :n35 : n32 = 64n3 = 6443 = 64=> n = 4

Lily · Answer

$b,\text{ }n^{35}\text{ : }n^{32}=64$$n^3=64$$n^3=4^3$$\Rightarrow\text{ }n=4$$c,\text{ }49\cdot7^{2n+3}=2401\cdot343$$7^2\cdot7^{2n+3}=7^4\cdot7^3$$7^{2n+3+2}=7^7$$7^{2n+5}=7^7$$\Rightarrow\text{ }2n+5=7$$2n=7-5$$2n=2$$n=2\text{ : }2$$n=1$Câu trả lời: $b,\text{ }n^{35}\text{ : }n^{32}=64$$n^3=64$$n^3=4^3$$\Rightarrow\text{ }n=4$$c,\text{ }49\cdot7^{2n+3}=2401\cdot343$$7^2\cdot7^{2n+3}=7^4\cdot7^3$$7^{2n+3+2}=7^7$$7^{2n+5}=7^7$$\Rightarrow\text{ }2n+5=7$$2n=7-5$$2n=2$$n=2\text{ : }2$$n=1$

Fudo · Answer

$b,\text{ }n^{35}\text{ : }n^{32}=64$$n^3=64$$n^3=4^3$$\Rightarrow\text{ }n=4$$c,\text{ }49\cdot7^{2n+3}=2401\cdot343$$7^2\cdot7^{2n+3}=7^4\cdot7^3$$7^{2n+3+2}=7^7$$7^{2n+5}=7^7$$\Rightarrow\text{ }2n+5=7$$2n=7-5$$2n=2$$n=2\text{ : }2$$n=1$Câu trả lời: $b,\text{ }n^{35}\text{ : }n^{32}=64$$n^3=64$$n^3=4^3$$\Rightarrow\text{ }n=4$$c,\text{ }49\cdot7^{2n+3}=2401\cdot343$$7^2\cdot7^{2n+3}=7^4\cdot7^3$$7^{2n+3+2}=7^7$$7^{2n+5}=7^7$$\Rightarrow\text{ }2n+5=7$$2n=7-5$$2n=2$$n=2\text{ : }2$$n=1$

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