a,(125*36):(5*9)=(125x40-125*4):45=(5000-500):45=4500:45=100
b,\(\frac{6}{16}+\frac{8}{18}+\frac{10}{16}+\frac{10}{18}\)\(=\left(\frac{6}{16}+\frac{10}{16}\right)+\left(\frac{8}{18}+\frac{10}{18}\right)\)\(=\frac{16}{16}+\frac{18}{18}=1+1=2\)
c,5,6*2+2,8*8+11,2*2-48,5=5,6*2+2,8*2*4+5,6*2*2-48,5=5,6*2+5,6*4+5,6*4-48,5
=5,6*(2+4+4)-48,5=5,6x10-48,4=56-48,5=7,5
\(a.\left(125\times36\right):\left(5\times9\right)\)
\(=\left(25\times5\times9\times4\right):\left(5\times9\right)\)
\(=\left(25\times4\right)\times\left(5\times9\right):\left(5\times9\right)\)
\(=25\times4\)
\(=100\)
\(b.\frac{6}{16}+\frac{8}{18}+\frac{10}{16}+\frac{10}{18}\)
\(=\left(\frac{6}{16}+\frac{10}{6}\right)+\left(\frac{8}{18}+\frac{10}{18}\right)\)
\(=\frac{16}{16}+\frac{18}{18}\)
\(=1+1\)
\(=2\)
\(c.5,6\times2+2,8\times8+11,2\times2-48,5\)
\(=11,2\times1+11,2\times2+11,2\times2-48,5\)
\(=11,2\times\left(1+2+2\right)-48,5\)
\(=11,2\times5-48,5\)
\(=56-48,5\)
\(=7,5\)
