0.8乘以0.25的简便算法

宇桦博823四点八乘以零点二五简便计算等于脱式计算, -
尤骂澜19520661220 ______[答案] 4.8*0.25 =(4+0.8)*0.25 =4*0.25+0.8*0.25 =1+0.2 =1.2

宇桦博8230.8x0.25x0.4x1.25怎么简便计算 -
尤骂澜19520661220 ______ 答:0.8*0.25*0.4*1.25 =(0.8*1.25)*(0.25*0.4) =1*0.1 =0.1

宇桦博8230.8乘(2.5十0.25)用简便方法计算 -
尤骂澜19520661220 ______ 0.8*(2.5+0.25) =0.8*2.5+0.8*0.25 =2+0.2 =2.2

宇桦博8230.25*0.7*0.8的简便运算? -
尤骂澜19520661220 ______ 0.25*0.7*0.8的简便运算: 都是乘法,优先级相同. 上式可写作: 0.25*0.8*0.7 =0.2*0.7 =0.14

宇桦博8230.8(0.25 25*1.25)用简便的方法怎么做 -
尤骂澜19520661220 ______ 0.8*(0.25+25*1.25) =0.8*0.25+0.8*25*1.25 =0.2+20*1.25 =0.2+25 =25.2

宇桦博8233.2*0.25的简便算法? -
尤骂澜19520661220 ______ 因为3.2=0.8*4,可以看出来4*0.25=1,所以整个式子可以变为0.8*4*0.25,先算4*0.25=1,再把1和0.8相乘就等于0.8.

宇桦博8234.8*0.25简便计算 -
尤骂澜19520661220 ______ 4.8*0.25 =1.2*4*0.25 =1.2*(4*0.25) =1.2*1 =1.2

宇桦博8230.8*0.25*0.4*12.5简便计算 -
尤骂澜19520661220 ______ 0.8*0.25*0.4*12.5 =(0.8*12.5)*(0.25*0.4) =10*0.1 =1

宇桦博8230.8÷0.25怎么简便算 -
尤骂澜19520661220 ______[答案] 0.8÷0.25 =0.8*4÷(0.25*4) =3.2÷1 =3.2

宇桦博8230.25乘以3.9加上0.75乘以2.5减去0.8乘以0.75的简便算法 -
尤骂澜19520661220 ______[答案] 原式=0.25*3.9 0.75*2.5-0.8*0.75 =0.75*1.3 0.75*2.5-0.8*0.75 =0.75*(1.3 2.5-0.8) =0.75*3 =2.25