2/5+3/5×4/9÷4/5=?
2/5+3/5×4/9÷4/5=?
5/9÷[4/5÷(3/5-1/4)]
9分之4÷5分之2= 12÷4分之3=
2/5×(3/4+1/5)÷9/10
1+2+3+4÷5=?
51+2/3÷5/3+71+3/4÷7/4+91+4/5÷9/5
X÷5/6=16/25 3/5x=2/5 5/6x=5/4 x÷3/2=9/40解方程
1/2÷4/5÷(2/9×3/8)=?简便计算
4^2÷(-1/4)-5^4÷(-5)^3,
3/()÷2=()/4 ()/5÷()=1/15
1÷2/1÷3/2÷4/3÷5/4÷6/5÷7/6÷8/7÷9/8÷10/9=?
1÷2÷3÷4÷5÷6÷7÷8÷9=2.8添上括号使等式成立