1.甲数是乙数的25%,乙数是甲的(400)%
1÷25%=4=400%
2.甲数比乙数多25%,乙数是甲数的(80)%
1÷(1+25%)=1÷125%=80%
3.甲数比乙数少20%,乙数比甲数多(25)%
1÷(1-20%)-1
=125%-1
=25%
1.甲数是乙数的25%,乙数是甲的(400)%
1÷25%=4=400%
2.甲数比乙数多25%,乙数是甲数的(80)%
1÷(1+25%)=1÷125%=80%
3.甲数比乙数少20%,乙数比甲数多(25)%
1÷(1-20%)-1
=125%-1
=25%