您好： 139又137/138+137×1又1/138=140-1/138+137x1+137x1/138=140-1/138+137+137/138=277又68/69 如果本題有什么不明白可以追問,如果滿意記得采納如果有其他問題請(qǐng)采納本題后另發(fā)點(diǎn)擊向我求助,答題不易,請(qǐng)諒解,...我還有幾道題。。。也幫幫吧……（9又2/7+7又2/9）÷（5/7+5/9）=（65/7+65/9）÷（5/7+5/9）=13x(5/7+5/9））÷（5/7+5/9）=1131998÷1998又1998/1999=1998÷【1998x(1+1/1999)】=1÷（1+1/1999）=1999/200 362+548*361分之362*548-186=（361x548+548-186）/(362+548x361）=(362+548x361)/(548x361+362)=141又1/3×3/4+51又1/4×4/5+61又1/5×5/6=40x3/4+4/3x3/4+50x4/5+5/4x4/5+60x5/6+6/5x5/6=30+1+40+1+50+1=123382+498*381分之 382*498-116=(381x498+498-116)/(382+498x381)=(381x498+382)/(382+498x381)=184又4/19*1.375+105又5/19*0.9=84又4/19x11/8+105又5/19x9/10=80x11/8+80/19x11/8+100x9/10+100/19x9/10=110+110/19+90+90/19=200+200/19=210又10/193又1/10+3又11/100+3又111/1000+3又1111/10000=3.1+3.11+3.111+3.1111=12.4321 6.8*8/25+0.32*4.2-8/25=6.8x0.32+0.32x4.2-0.32=0.32x(6.8+4.2-1)=0.32x10=3.2 （96又63/73+36又24/25）/（32又21/73+12又8/25）=3x(32又21/73+12又8/25)/(32又21/73+12又8/25)=3