Question

80乘3.5乘3.5加160乘3.5乘1.5加80乘1.5乘1.5求大神帮助

用简便方法计算、谢谢~

Answer 1

原式=80×3.5^2+160×3.5×1.5+80×1.5^2 =80×(3.5^2+2×3.5×1.5+1.5^2) =80×(3.5+1.5)^2 =80×25 =2000

麻烦采纳，谢谢!