Toán Lớp 6: 3. ( 2 . x – 1) mũ 3 – 1 mũ 2020 = 5. 4 mũ 2
5 mũ x+1 .5 – 5 mũ x = 500
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Toán Lớp 6: 3. ( 2 . x – 1) mũ 3 – 1 mũ 2020 = 5. 4 mũ 2
5 mũ x+1 .5 – 5 mũ x = 500
Chả lời nhanh hộ mình
Comments ( 2 )
3.(2.x-1)^3-1=5.16
3.(2.x-1)^3-1=80
3.(2.x-1)^3=80+1
3.(2.x-1)^3=81
(2.x-1)^3=81:3
(2.x-1)^3=3^3
=>2.x-1=3
=>2.x=3+1
=>2.x=4
=>x=4:2
=>x=2
5^x. 5-5^x. 1=500
5^x.(5-1)=500
5^x. 4=500
5^x=500:4
5^x=125
5^x=5^3
=>x=3
Vậy x=3