=3/17×5.4+0.37×30/17+9.1×14/17
=3/17×5.4+0.37×10×3/17+9.1×14/17
=3/17×(5.4+3.7)+9.1×14/17
=3/17×9.1+9.1×14/17
=(3/17+14/17)×9.1
=1×9.1
=9.1
=3/17×5.4+0.37×30/17+9.1×14/17
=3/17×5.4+0.37×10×3/17+9.1×14/17
=3/17×(5.4+3.7)+9.1×14/17
=3/17×9.1+9.1×14/17
=(3/17+14/17)×9.1
=1×9.1
=9.1