2/3减去50%除30%的商,所得的差再除以4/5,结果是多少?列算式.
问题描述:
2/3减去50%除30%的商,所得的差再除以4/5,结果是多少?列算式.
答
(2/3 -30%÷50%)÷4/5
=(2/3-3/10 ÷1/2)÷4/5
=(2/3-3/10 ×2)÷4/5
=(2/3-3/5)×5/4
=2/3 ×5/4 -3/5×5/4
=5/6 -3/4
=1/12