Question

利用因式分解来计算:36*1.6^2 - 16*1.4^2 写出具体的步骤

Answer 1

36*1.6^2-16*1.4^2=(6*1.6)^2-(4*1.4)^2=9.6^2-5.6^2

=(9.6+5.6)(9.6-5.6)=15.2*4=60.8