Toán Lớp 6: B)2x+3=-1/2 C)(x-1/5)^3=8/27
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Toán Lớp 6: B)2x+3=-1/2 C)(x-1/5)^3=8/27
Comments ( 2 )
Giải đáp + Lời giải và giải thích chi tiết:
b)
2x+3=-1/2
=>2x=-1/2-3
=>2x=-1/2-6/2
=>2x=-7/2
=>x=-7/2:2
=>x=-7/2. 1/2
=>x=-7/4
Vậy x=-7/4
c)
(x-1/5)^3=8/27
=>(x-1/5)^3=(2/3)^3
=>x-1/5=2/3
=>x=2/3+1/5
=>x=10/15+3/15
=>x=13/15
Vậy x=13/15
b)2x+3=-1/2
2x=-1/2-3
2x=-7/2
x=-7/4
c)({x-1}/5)^3=8/27
({x-1}/5)^3=(2/3)^3
⇔{x-1}/5=2/3
(x-1):5=2/3
x-1=10/3
x=13/3