(1.5+3分之2)÷3.75-3分之2

问题描述:

(1.5+3分之2)÷3.75-3分之2

(1.5+2/3)÷3.75-2/3
=(3/2+2/3) ÷ 15/4 - 2/3
=3/2 × 4/15 + 2/3 × 4/15 -2/3
=2/5 +2/3(4/15-1)
=2/5 + 2/3 (- 11/15)
=2/5- 2/3×11/15
=2/5-22/45
=-4/45

(1.5+3分之2)÷3.75-3分之2
=(3/2+2/3)/3.75-2/3
=13/6/3.75-2/3
=13/(6*3.75)-2/3
=13/(6*27/4)-2/3
=(13*4)/(6*27)-2/3
=26/81-54/81
=-28/81

(1.5+3分之2)÷3.75-3分之2
=(2分之3+3分之2)÷4分之15-3分之2
=(2分之3+3分之2)×15分之4-3分之2
=2分之3×15分之4+3分之2×15分之4-3分之2
=5分之2+45分之8-3分之2
=45分之18+45分之8-45分之30
=-45分之4