\(\frac{1}{2}\times10+9=\hept{\begin{cases}?\\+\\5\end{cases}}\)

\(\frac{1}{2}+\frac{1}{2}+56+9+1\hept{\begin{cases}?\\+\\12\end{cases}}\)

\(\frac{1}{2}+\frac{1}{2}\times3+9\hept{\begin{cases}?\\+\\6\end{cases}}\)

\(\frac{1}{2}\times6+67\hept{\begin{cases}?\\+\\13\end{cases}}\)

\(\frac{1}{2}+\frac{1}{2}\times8+7\hept{\begin{cases}?\\+\\6\end{cases}}\)

5 BÀI TOÁN NHÉ!

1.Tính:

8  :8=   16:8=   24:8=

32:8=   40:8=   48:8=

56:8=   64:8=   72:8=

            80:8=

2.Số?

\(...\times\frac{1}{8}=1\) \(...\times\frac{1}{8}=2\)\(...\times\frac{1}{8}=3\)\(...\times\frac{1}{8}=4\)

\(...\times\frac{1}{8}=5\) \(...\times\frac{1}{8}=6\)\(...\times\frac{1}{8}=7\)

\(...\times\frac{1}{8}=8\)\(...\times\frac{1}{8}=9\)   

\(...\times\frac{1}{8}=10\)

\(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}-\frac{9}{a+b+c}=0\)

\(\frac{bc}{abc}+\frac{ac}{bca}+\frac{ab}{cab}-\frac{9abc}{\left(a+b+c\right)abc}=0\)

\(\left(A+b+c\right)bc+\left(a+b+c\right)ac+\left(a+b+c\right)ab-9abc=0\)

\(b^2c+c^2b+abc+a^2c+c^2a+abc+a^2b+b^2a+abc-9abc=0\)

\(b^2c+c^2b+a^2c+c^2a+a^2b+b^2a-6abc=0\)

\(c\left(b^2+a^2\right)+b\left(c^2+a^2\right)+a\left(c^2+b^2\right)-6abc=0\)

\(c\left(b^2+a^2-2ab\right)+b\left(c^2-2ac+a^2\right)+a\left(c^2+2cb+b^2\right)=0\)

\(c\left(b-a\right)^2+b\left(c-a\right)^2+a\left(c-b\right)^2=0\)

\(\)