0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/21 16:11:46

0.75×15+4.5×2.5
=(1-0.25)*15+45*0.25
=15-15*0.25+45*0.25
=15+30*0.25
=15+7.5
=22.5
3.6×31.4+43.9×6.4
=3.6*31.4+(31.4+12.5)*6.4
=31.4*(3.6+6.4)+12.5*6.4
=31.4*10+(10+2.5)*6.4
=314+64+2.5*6.4
=378+2.5*(6+0.4)
=378+2.5*0.4+2.5*6
=378+1+15
=394

0.75×15+4.5×2.5 3.6×31.4+43.9×6.4 的简便运算 5.48+3.6+4.52+6.4的简便运算 4.6×0.75+0.46×2.5的简便运算 6.4*1.25的简便运算 15/0.25的简便运算 4.5乘以3.6加上5.2乘以0.35的简便运算 0.75*15+4.5*2.5 3.6*31.4+43.9*6.4 简便计算 3.2+6.4×3.2+6.4的简便运算 6.4-1.2×0.65的简便运算简便运算1.2乘以2.5乘以64,4.5乘以3.6+6.4 .7.54-（3.2-2.46） 0.25*39+0.75*27的简便运算 3.6÷0.25的简便运算