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d)3600/[(5x+355)/x]=50
(5x+355)/x=3600/50
5+355/x=72
355/x=72-5
355/x=67
x=355/67
(723.45 + 723.4): 725
= 723.(45 + 4):725
= 723.49:725
= 723.72:725
= 725:725
= 1
\(\left(7^{23}.45+7^{23}.4\right):7^{25}\)
\(=\left[7^{23}.\left(45+4\right)\right]:7^{25}\)
\(=\left[7^{23}.49\right]:7^{25}\)
\(=\left[7^{23}.7^2\right]:7^{25}\)
\(=7^{25}:7^{25}\)
\(=1\)
\(\left(57-725\right)-\left(605-53\right)\)
\(=57-725-605+53\)
\(=\left(57+53\right)-\left(725+605\right)\)
\(=110-1330=-1220\)
(57−725)−(605−53)(57−725)−(605−53)
=57−725−605+53=57−725−605+53
=(57+53)−(725+605)=(57+53)−(725+605)
=110−1330=−1220
phá ngoặc ta có
57 - 725 - 605 + 53
= -668 - 605 + 53
= -1273 + 53
=-1220
(57-725)-(605-53)=
(-668)-552=
-1220
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Ta có: \(7256.4375-\dfrac{725}{3650}+4375.7255\)
\(=7256.4375+4375.7255-\dfrac{29}{146}\)
\(=4375\left(7256-7255\right)-\dfrac{29}{146}\)
\(=4375.1-\dfrac{29}{146}\)
\(=\dfrac{638750}{126}-\dfrac{29}{126}\)
\(=\dfrac{638721}{126}=\dfrac{70969}{14}\)
Chúc bn học tốt!!!
\(=\)\(\dfrac{\left(7256+1\right).4275-725}{3650+4375.7255}\)
\(=\)\(\dfrac{7255.4375+1.4375-725}{3650+4375.7255}\)
\(=\)\(\dfrac{7255.4375+3650}{3650+4375.7255}\)
\(=1\)
\(\dfrac{7256.4375-725}{3650+4375.7255}\)
\(=\dfrac{\left(7255+1\right).4375-725}{3650+4375.7255}\)
\(=\dfrac{7255.4375+1.4375-725}{3650+4375.7255}\)
\(=\dfrac{7255.4375+4375-725}{3650+4375.7255}\)
\(=\dfrac{7255.4375+3650}{3650+4375.7255}\)
\(=1\)
\(725-5x=355\)
\(5x=725-355=370\)
\(x=370:5=74\)
725 - 5x = 355
=> 5x = 725 - 355
=> 5x = 370
=> x = 74