简便计算41.2*8.1+11*1.25+53.7*1.9

Answer 1

原式=41.2*（10-1.9）+53.7*1.9+11*1.25
=41.2*10-41.2*1.9+53.7*1.9+11*1.25
=412+（53.7-41.2）*1.9+11*1.25
=412+12.5*1.9+11.1.25
=412+1.25*19+11*.25
=412+（11+19）*1.25
=412+30*1.25
=412+37.5
=449.5

Answer 2

原式 = 41.2 *（8+0.1） + （8+3）*1.25 + 53.7*(2-0.1)
= 329.6 + 4.12 + 10 + 3.75 + 107.4 - 5.37
= (329.6+107.4) + 14.12 + 3.75 - 5.37
= 437 + (17.87-5.37)
= 437 + 12.5
= 449.5