Toán Lớp 6: c. 5x – 5 mũ 2 = 10
d. 9x – 2.3 mũ 2 = 3 mũ 4
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Toán Lớp 6: c. 5x – 5 mũ 2 = 10
d. 9x – 2.3 mũ 2 = 3 mũ 4
Comments ( 2 )
5x-5^2=10
=>5x-25=10
=>5x=10+25
=>5x=35
=>x=35:5
=>x=7
Vậy x=7
d)
9x-2.3^2=3^4
=>9x-2.9=81
=>9x-18=81
=>9x=81+18
=>9x=99
=>x=99:9
=>x=11
Vậy x=11