Toán Lớp 6: Tìm x,y biết:
g) (55-x).(2x-44)=0
h) x mũ 2 + 4 =13
i) 2.(x+1) mũ 3 = 16
j) 150 -5(x-2) mũ 2 = 25
k) (x-2).y=3
l) (2-x).(y-4)=8
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Toán Lớp 6: Tìm x,y biết:
g) (55-x).(2x-44)=0
h) x mũ 2 + 4 =13
i) 2.(x+1) mũ 3 = 16
j) 150 -5(x-2) mũ 2 = 25
k) (x-2).y=3
l) (2-x).(y-4)=8
Comments ( 1 )
=> 55-x=0 hoặc 2x-44=0
x=22
vậy x = 55 hoặc 22
h) x^2+4=13
x^2=9
x^2=3^2
Vậy x=3
i) 2.(x+1)^3=16
(x+1)^3=16:2
(x+1)^3=8
(x+1)^3=2^3
=>x+1=2
x=1
j) 150-5.(x-2)^2=25
5.(x-2)^2=150-25
5.(x-2)^2=125
(x-2)^2=125:5
(x-2)^2=25=5^2
=> x-2=5
x=7
2 câu cuối mik ko bt