Toán Lớp 6: 1.Tìm x
b) 4 ∧ 2x – 1 = 64
c ) ( 2 x – 1 ) ∧ 2 + 2 ∧ 0 * 3 ∧ 2 = 8*9 +18
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Toán Lớp 6: 1.Tìm x
b) 4 ∧ 2x – 1 = 64
c ) ( 2 x – 1 ) ∧ 2 + 2 ∧ 0 * 3 ∧ 2 = 8*9 +18
Comments ( 1 )
4^(2x-1)=4^3
=>2x-1=3
=>2x=3+1
=>2x=4
=>x=4:2
=>x=2
c) ( 2 x – 1 )^2 + 2^0 . 3^2 = 8.9 +18
(2x-1)^2+1.9=72+18
(2x-1)^2+9=90
(2x-1)^2=90-9
(2x-1)^2=81
(2x-1)^2=9^2
=>2x-1=9
=>2x=9+1
=>2x=10
=>x=10:2
=>x=5