Toán Lớp 6: tìm số tự nhiên x: (4x – 1) mũ 2 = 25. 913) (2x – 3) mũ 3 = 125
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Toán Lớp 6: tìm số tự nhiên x: (4x – 1) mũ 2 = 25. 913) (2x – 3) mũ 3 = 125
Comments ( 2 )
(4x-1)^2=225
(4x-1)^2=15^2
=>4x-1=15
=>4x=15+1
=>4x=16
=>x=16:4
=>x=4
(2x – 3)^3=125
(2x-3)^3=5^3
=>2x-3=5
=>2x=5+3
=>2x=8
=>x=8:2
=>x=4