算一算,填一填45km2= m225000mL= L10t= g 15kg500g﹣5000g= kg2608mL=2L+ mL.
1.25×(m+8)=1.25m+10 .
31×25×4=31×( × )
18.25+6.2+1.75=6.2+( + ),根据的运算定律是 .
a×3+3×b=3ab. .
加法交换律与乘法交换律表达的意义实际上是一样的. .