4.53*32+57.8*6.8+6.12*925
=4.53*32+(45.3+12.5)*6.8+6.12*925
=45.3*3.2+45.3*6.8+12.5*6.8+6.12*925
=45.3*(3.2+6.8)+12.5*6.8+6*925+12*9.25
=453+6*925+(12+0.5)*6.8+12*(9.2+0.05)
=453+6*925+12*(6.8+9.2)+3.4+0.6
=453+6*925+12*16+4
=453+6*(925+32)+4
=457+6*957
=457+5742
=6199
