(10+3/5)×(9+2/5)
=(10+3/5)×(10-3/5)
=10×10-3/5×3/5
=100-9/25
=99+16/25
=99又25分之16
原式=(10+3/5)(9+2/5)
=(10+3/5)(10-3/5)
平方差公式
=10*10-(3/5)*(3/5)
=100-9/25
=99又16/25
=99又25分之16
(10+3/5)*(10-3/5)=100-9/25
(10+3/5)(10-3/5)=100-9/25=99又25分之16
(10*3/5)*(9*2/5)=(50+3)*(50-3)/25=99又25分之16
(10+3/5)(10-3/5)