第1个回答 2012-10-09
(1)原式=265×4/3+578×3/4+157×4/3 =(157+265)×4/3+289×3/2 =422×4/3+289×3/2 =422×8/6+289×9/6 =5977/6 (2)原式=(7×9×12)分 之(5×9×12+5×7×12+5×7×9)乘以(7+9+12)分之(7×9×12) =1275/28 (3)原式=3/8乘5/11+3/8乘28/11-8 =负六又八分之七 (4)原式=33×3/5+44×3/5+24×3/5-3/5 =(33+44+24-1)×3/5=60 (5)X-15%X=6 (6)X-2/7X=3/4 85%X=6 5/7X=3/4 X=120/17 X=21/20 (7) (8)X÷6/35=26/45×13/25 X=26/45×13/25×6/35 X=676/13125 (9)X+7/8X=3/4 15/8X=3/4 X=2/5