Toán Lớp 7: $\frac{2-x}{4}$=$\frac{16}{2-x}$
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Toán Lớp 7: $\frac{2-x}{4}$=$\frac{16}{2-x}$
help me
Comments ( 2 )
\frac {2 – x }{4} = {16}{2 – x }
⇒ ( 2 – x ). ( 2 – x ) = 4 . 16
⇒ ( 2 – x ). ( 2 – x ) = 64
⇒ $( 2 – x )^{2}$ = $8^{2}$
TH1:
⇒ 2 – x = 8
⇒ x = 2 – 8
⇒ x = 2 – 8
⇒ x =-6
TH2 :
⇒ 2 – x = -8
⇒ x = 2 – (-8)
⇒ x =10
Chúc bạn học tốt!
Cho mình 5 sao + ctlhn nha!Cảm ơn bạn!
@nphuongngan451
(2-x)/4 =16/(2-x)
=> (2-x).(2-x)=16.4
=> (2-x)^2 = 64
=> (2-x)^2 = 8^2
=> [(2-x=8),(2-x=-8):}
=> [(x=2-8),(x=2-(-8)):}
=> [(x=-6),(x=10):}
Vậy x in {-6; 10}