tìm x

V

vipboycodon

$10+2x = 4^5:4^3$
<=> $10+2x = 4^2$
<=> $2x = 16-10$
<=> $2x = 6$
<=> $x = 3$

$70-59(x-3) = 45$
<=> $70-59x+177 = 45$
<=> $-59x = 45-70-177$
<=> $-59x = -202$
<=> $x = \dfrac{202}{59}$

$4x^3+15 = 47$
<=> $4x^3 = 47-15$
<=> $4x^3 = 32$
<=> $x^3 = 8$
<=> $x = 2$
 
Last edited by a moderator:
D

duc_2605

70-59(x-3)=45
70 - (59x - 177) = 45
\Rightarrow 59x - 177 = 70 - 45
\Rightarrow 59x - 177 = 25
\Rightarrow 59x = 25 + 177 = 202
\Rightarrow x = 202 : 59 = 202/59
 
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