脱式计算 1.65×(5-2又6/7)÷1.25 ————————————(大分数线) (3/7+1又1/3)÷7/9×1.1
问题描述:
脱式计算 1.65×(5-2又6/7)÷1.25 ————————————(大分数线) (3/7+1又1/3)÷7/9×1.1
答
1.65×(5-2又6/7)÷1.25 / (3/7+1又1/3)÷7/9×1.1
=33/20x(5-20/7)÷5/4 / (3/7+4/3)x9/7x1.1
=33/20x15/4x4/5 / (9/21+28/21)x9/7x11/10
=99/20 / 99/70 x37/21
=70/20x37/21
=7/2x37/21
=37/6