Toán Lớp 6: -a)3x-61=5
b)12-(3x+4)=-7
c)5 mũ x+2 -5 mũ x =3.10 mũ 3
d)(2x+1)⁝(x-1)
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Toán Lớp 6: -a)3x-61=5
b)12-(3x+4)=-7
c)5 mũ x+2 -5 mũ x =3.10 mũ 3
d)(2x+1)⁝(x-1)
Comments ( 1 )
=> 3x = 66
=> x = 66 ÷ 3 = 33
=> 3x + 4 = 12 + 7
=> 3x = 19 – 4
=> 3x = 15
=> x = 15 ÷ 3 = 5
=> 5^x . 5² – 5^x = 3. 1000
=> 5^x . (25-1) = 3000
=> 5^x = 3000 ÷ 24 = 125
=> 5^x = 5³
=> x = 3