练习七1. 3/2 2/7 20 1/2 3/8 1/6 15/2 02.(1)10×4/5×5/8=5(吨) (2)36×2/3×3/4=18(个)3.(75+65)×6/7=120(千米)4. 6/5-3×1/4=9/20(升)5.(2/3+4/5)×3/4=11/10(吨)6. x=3/10 x=3/5 x=507. 7/13×2/5-2/13×2/5 24-24×18/19 5/7÷1/4+5/7÷3/4=(7/13-2/13)×2/5 =24-(1-18/19) =5/7×4+7/5×4/3= 5/13×2/5 =24-1/19 =5/7×(4+4/3)= 2/13 =24/19 |