急需小学四年级下册数学计算题和应用题及答案50道。不要小数乘除法的。
1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6C2/9×34.8×5/4+1/45.6÷3/8C3/8÷66.4/7×5/9+3/7×5/97.5/2-(3/2+4/5)8.7/8+(1/8...
1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6C2/9×34.8×5/4+1/45.6÷3/8C3/8÷66.4/7×5/9+3/7×5/97.5/2-(3/2+4/5)8.7/8+(1/8...