51.7-34.8
=51.7-(35-0.2)
=51.7-35+0.2
=16.7+0.2
=16.9
710-182
=710-(200-18)
=710-200+18
=510+18
=528
1.25*2.4
=1.25*8*0.3
=10*0.3
=3
468/12
=3*4*39/3*4
=39