Question

用简便方法计算：1.71*5.6*5.6+3.42*5.6*4.4+4.4*4.4*1.71

Answer 1

1.71*5.5*5.6+3.42*5.6*4.4+4.4*4.4*1.71=1.71*(5.6^2+2*5.6*4.4+4.4^2)=1.71*(5.6+4.4)^2=171