Câu hỏi của Cao Thanh Thủy

Question

(3.x - 2 mũ 4) : 7 mũ 3 = 2.7 mũ 4

Phạm Quang Lộc · Accepted Answer

$(3.x-2^{4} ):7^3 =2.7^{4}$

$=>(3.x-16):7^{3} =2.7^{4}$

$=>3.x-16=2.7^{4}:7^{3}$

$=>3.x-16=2.7^{4-3}$

$=>3.x-16=2.7$

$=>3.x-16=14$

$=>3.x=14+16$

$=>3.x=30$

$=>x=30:3$

$=>x=10$Câu trả lời: $(3.x-2^{4} ):7^3 =2.7^{4}$

$=>(3.x-16):7^{3} =2.7^{4}$

$=>3.x-16=2.7^{4}:7^{3}$

$=>3.x-16=2.7^{4-3}$

$=>3.x-16=2.7$

$=>3.x-16=14$

$=>3.x=14+16$

$=>3.x=30$

$=>x=30:3$

$=>x=10$

Nguyễn Đức Trí · Answer

$\left(3x-2^4\right):7^3=\left(2.7\right)^4$

$\Rightarrow\left(3x-2^4\right)=2^4.7^4.7^3$

$\Rightarrow3x-2^4=2^4.7^7$

$\Rightarrow3x=2^4.7^7+2^4$

$\Rightarrow3x=2^4.\left(7^7+1\right)=16\left(7^7+1\right)$

$\Rightarrow x=\dfrac{16\left(7^7+1\right)}{3}$Câu trả lời: $\left(3x-2^4\right):7^3=\left(2.7\right)^4$

$\Rightarrow\left(3x-2^4\right)=2^4.7^4.7^3$

$\Rightarrow3x-2^4=2^4.7^7$

$\Rightarrow3x=2^4.7^7+2^4$

$\Rightarrow3x=2^4.\left(7^7+1\right)=16\left(7^7+1\right)$

$\Rightarrow x=\dfrac{16\left(7^7+1\right)}{3}$

Phạm Quang Lộc · Answer

Sửa lại.

$(3x-2^{4}):7^{3}=2.7^{4}$

$=>3x-2^{4} =2.7^{4}.7^{3}$

$=>3x-2^{4} =2.7^{7}$

$=>3x=2.7^{7}+2^{4}$

$=>x=\dfrac{2.7^{7}+16}{3}$
 Câu trả lời: Sửa lại.

$(3x-2^{4}):7^{3}=2.7^{4}$

$=>3x-2^{4} =2.7^{4}.7^{3}$

$=>3x-2^{4} =2.7^{7}$

$=>3x=2.7^{7}+2^{4}$

$=>x=\dfrac{2.7^{7}+16}{3}$