a) Thay x=64,13 vào biểu thức ta có:
A=5,35x(64,13+35,87)-135
=5,35x100-135
=535-135
=400
b) \(5,35\cdot\left(x+35,87\right)-135=89,7\)
\(\Rightarrow5,35\cdot\left(x+35,87\right)=89,7+135=224,7\)
\(\Rightarrow x+35,87=224,7:5,35=42\)
\(\Rightarrow x=42-35,87=6,13\)
\(\Rightarrow x=6,13\)
\(a\)) Thay \(x=64,13\)\(,\)Ta có \(:\)
\(A=5,35x\left(64,13+35,87\right)-135\)
\(A=5,35x100-135\)
\(A=535-135\)
\(A=400\)
\(b\)) \(\Leftrightarrow5,35x\left(X+35,87\right)-135=89,7\)
\(\Leftrightarrow5,35x\left(X+35,87\right)=89,7+135\)
\(\Leftrightarrow5,35x\left(X+35,87\right)=224,7\)
\(\Leftrightarrow X+35,87=224,7:5,35\)
\(\Leftrightarrow X+35,87=42\)
\(\Leftrightarrow X=42-35,87\)
\(\Leftrightarrow X=6,13\)
a, Thay x=64,13 , ta có biểu thức : A=5,35.(64,13+35,87)-135 =5,35.100-135 =535-135 = 400 b,ThayA=89,7, ta có biểu thức: 89,7=5,35.(x+35,87)-135 89,7+135=5,35.(x+35,87) 224,7=5,35.(x+35,87) 224,7:5,35=x+35,87 42=x+35,87 42-35,87=x 6,13=x Vậy A=400 ; x=6,13
(p-q) :r với p= 132 ,q=28 và r=4
