Toán Lớp 6: tìm x
a. 7 x – 20 = 71
b. (2 X +1)mũ 3= 9.81
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Toán Lớp 6: tìm x
a. 7 x – 20 = 71
b. (2 X +1)mũ 3= 9.81
Comments ( 2 )
a)
7x-20=71
=>7x=71+20
=>7x=91
=>x=91:7
=>x=13
Vậy x=13
b)
(2x+1)^3=9.81
=>(2x+1)^3=9.9^2
=>(2x+1)^3=9^3
=>2x+1=9
=>2x=9-1
=>2x=8
=>x=8:2
=>x=4
Vậy x=4