Toán Lớp 7: a,1/2:(x+1)=2,5:1/4
b,(x)+2²=3² +(1/2)³
c,(x+4/5)-3/5+6/5
d,5-(x+1/2)²=5mũ 0
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 7: a,1/2:(x+1)=2,5:1/4
b,(x)+2²=3² +(1/2)³
c,(x+4/5)-3/5+6/5
d,5-(x+1/2)²=5mũ 0
Comments ( 2 )
Gửi bạn ạ:
\text{Milk gửi ẹ}????????
\text{Giải đáp+ Lời giải và giải thích chi tiết:}
a) 1/2:(x+1)=2,5:1/4
<=>1/2:(x+1)=10
<=>x+1=1/20
<=>x=-19/20
Vậy x=-19/20
b) x+2^2=3^2+(1/2)^3
<=>x+4=9+1/8
<=>x=41/8
Vậy x=41/8
c) (x+4/5)-3/5+6/5
=x+4/5-3/5+6/5
=x+7/5
d) 5-(x+1/2)^2=5^0
<=>5-(x+1/2)^2=1
<=>(x+1/2)^2=4
<=>(x+1/2)^2=(+-2)^2
<=> $\left[\begin{matrix} x+\frac{1}{2}=2\\ x+\frac{1}{2}=-2\end{matrix}\right.$<=> $\left[\begin{matrix} x=\frac{3}{2}\\ x=\frac{-5}{2}\end{matrix}\right.$
Vậy x=3/2 hoặc x=-5/2.