1278 + X x 8 = 4878
X x 8 = 4878-1278
X x 8 = 3600
x=450
\(1278+x\times8=4878\)
\(\Rightarrow x\times8=4878-1278\)
\(\Rightarrow x\times8=3600\)
\(\Rightarrow x=3600:8\)
\(\Rightarrow x=450\)
Vậy x = 450
1278 + X x 8 = 4878
=>X x 8 = 4878-1278 =3600
=>X=3600 : 8
=> X = 450
1278+Xx8=4878
Xx8=4878-1278
Xx8=3600
X =3600:8
X =450
\(1278+x\times8=4878\)
\(x\times8=4878-1278\)
\(x\times8=3600\)
\(x=3600\div8\)
\(x=450\)
\(1278+x\times8=4878\)
\(x\times8=4878-1278=3600\)
\(x=3600:8\)
\(x=450\)
\(1278+x.8=4878\)
\(\Leftrightarrow8x=3600\)
\(\Leftrightarrow x=450\)
\(1278+X\times8=4878\)
\(X\times8=4878-1278\)
\(X\times8=3600\)
\(X=\frac{3600}{8}=450\)
\(1278+x\times8=4878\)
\(x\times8=4878-1278\)
\(x\times8=3600\)
\(\Rightarrow x=450\)
1278 + X x 8 = 4878
X x 8 = 4878 -1278
X x 8 = 3600
X = 3600 : 8
X = 450
Vậy X = 450