九分之五乘以七十九又七分之六+50乘以九分之一+九分之十一乘以十七分之五
5/9x(79+6/7)+50x1/9+11/9x5/17
=5/9x(79+6/7+10+11/17)
=5/9x(89+[102+77]/119)
=5/9x(89+1+60/119)
=10+5/9x60/119
=10+100/357