1.50×84/89＋46*42/89+84*26/89
=50×84/89+23×84/89+84×26/89
=84/89(50+23+26)
=84*99/89
=8316/89
2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125
=13又 4/19+86又 15/19(*0.25+0.625+0.125)
=13又 4/19+86又 15/19*1
=13+86+4/19+15/19
=99+1
=100
3．77*1/8+7/8*23又 10/13+7/13*3/8
=11*7/8+7/8*23又 10/13+7/8*3/13
=7/8(11+23+10/13+3/13)
=7/8*(35)
=245/8