8/17×0.8+4/5+17/9×0.8简便计算

8/17×0.8+4/5+17/9×0.8简便计算
8/17×0.8+4/5+17/9×0.8简便计算

8/17×0.8+4/5+17/9×0.8简便计算
原题是这样的吧：8/17×0.8+4/5+9/17×0.8
8/17×0.8+4/5+9/17×0.8
=(8/17+9/17)×0.8+4/5
=1×0.8+0.8
=1.6

0.8=4/5
=8/17*4/5+1*4/5+17/9+4/5
=4/5*(8/17+1+17/9)
=4/5*42/43
=168/215