7分之3X5.4-7分之3X0.4+7分之3X2
=3/7*(5.4-0.4+2)
=3/7*7
=3
63X62分之51
=(62+1)*51/62
=62*51/62+51/62
=51+51/62
=51又51/62
62X63分之52
=(63-1)*52/63
=63*52/63-52/63
=52-52/63
=51又11/63
7分之3X5.4-7分之3X0.4+7分之3X2
=3/7*(5.4-0.4+2)
=3/7*7
=3
63X62分之51
=(62+1)*51/62
=62*51/62+51/62
=51+51/62
=51又51/62
62X63分之52
=(63-1)*52/63
=63*52/63-52/63
=52-52/63
=51又11/63