0.45×1.25+ 1.55÷0.8简便方法?
0.45×1.25+1.55÷0.8
=0.45×1.25+1.55÷4/5
=0.45×1.25+1.55×5/4
=0.45×1.25+1.55×1.25
=(0.45+1.55)×1.25
=2×1.25
=2.5
简便运算主要是通过交换律、结合律,将相关数字交换结合,凑成整数,达到速算目的。
0.45×1.25+1.55÷0.8
=0.45×1.25+1.55×1.25
=1.25×(0.45+1.55)
=1.25×2
=2.5
这道题也没有什么简便的方法,就是按照一般的运算规律去上就可以了。
0.45×1.25+1.55÷0.8
=0.45×1.25+1.55×1.25
=1.25×(0.45+1.55)
=1.25×2
=2.5
0.45×1.25+1.55÷4/5=0.45×1.25+1.55×1.25
=1.25(0.45+1.55)=1.25×2=2.5