Toán Lớp 6: x+8x = 4^5 : 4^3 + 2^2 . 5
4( 4 – x )^2 – 2. 5^2 = -46
187 – 4( 2x – 1 )^3 = 79
2. 3^2x + 3 – 1 = 485
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Toán Lớp 6: x+8x = 4^5 : 4^3 + 2^2 . 5
4( 4 – x )^2 – 2. 5^2 = -46
187 – 4( 2x – 1 )^3 = 79
2. 3^2x + 3 – 1 = 485
Comments ( 2 )
x+8x=4^5 : 4^3 + 2^2 . 5
9x=4^2 + 4.5
9x=16+20
9x=36
x=36:9
x=4
4.(4-x)^2 – 2.5^2 = -46
4.(4-x)^2 – 2.25=-46
4.(4-x)^2 – 50=-46
4.(4-x)^2 = 4
(4-x)^2 = 1
(4-x)^2 = 1^2
4-x=1
x=3
187-4.(2x-1)^3 = 79
4.(2x-1)^3 = 108
(2x-1)^3 = 108:4
(2x-1)^3 = 27
(2x-1)^3 = 3^3
2x-1=3
2x=4
x=2
2.3^2 x +3-1=485
2.9.x+2=485
18x=483
x=483:18
x=26,83
@chitran3
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