ldcf.net
当前位置:首页 >> (1.25+2.5)×0.8简便计算 >>

(1.25+2.5)×0.8简便计算

(1.25+2.5)×0.8 =1.25x0.8+2x1.25x0.8 =1+2 =3 请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!谢谢管理员推荐采纳!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

分配律

(2.5×1.25)×0.8 =2.5×(1.25×0.8) =2.5×1 =2.5

(1.25+2.5)×0.8 =1.25×0.8+2.5×0.8 =1+2 =3 乘法结合律计算

1.25×2.5×(8+4) =1.25×2.5×8+1.25×2.5×4 = 1.25×8×2.5+ 2.5×4×1.25 = 10×2.5+10×1.25 = 25+12.5 = 37.5

利用乘法结合律。

(2.5+1.25)x4x0.8 =2.5x4x0.8+1.25x0.8x4 =10x0.8+1x4 =8+4 =12

-4×8×(-2.5)×0.2×(-1.25)×5怎么算 =-(4x2.5)x(8x1.25)x(0.2x5) =-10x10x1 =-100

1.25×2.5×0.8×40 =1.25×0.8×(2.5×40) =1x100 =100

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com