2.8除以4加7.2乘0.25简便计算

1/2X3X4X5+1/3X4X5X6+1/4X5X6X7.1/97X98X99X100=?=1/3[1/2*3*4-1/3*4*5]+1/3[1/3*4*5-1/4*5*6]+1/3[1/4*5*6

8分之7乘4分之1加0.25乘0.125=7/8x1/4+1/4x1/8=1/4x(7/8+1/8)=1/4x1=1/415分之2乘【12.6减(5分之33加0.125除以12.5%)】=2/15x(

裂两项相消法：完全是凑出简单的几项和差的形式进行化简：步骤一：待定系数法-----设An=1/[n(n-1)(n-2)];(n>=3,n∈N*)；令An=A/(n-2)+B/(n-1)+C/n;通分后

0.625除以7分之5加5分之7乘8分之3=8分之5乘5分之7加5分之7乘8分之3=5分之7乘(8分之5加8分之3)=5分之72.75乘5分之31加2.8除以11分之4加4分之11=(4分之11乘5分

5.23乘4加4.77除以0.25=5.23×4+4.77×4=（5.23+4.77）×4=10×4=40

3.64÷4+4.36×0.25=3.64×1/4+4.36×0.25=3.64×0.25+4.36×0.25=0.25×（3.64+4.36）=0.25×8=2

4又5分之1乘25加32又7分之4除以4加0.25乘125=（4+1/5）×25+(32+4/7)÷4+0.25×125=100+5+8+1/7+125/4=113+1/7+31+1/4=144+4/

4.5625

4.7乘4分之1加0.25乘4.3减1除以4=4.7*1/4+0.25*4.3-1/4=1/4(4.7+4.3-1)=1/4*8=2

0.91乘99加91乘0.01=0.91*（99+1）=0.91*100=911.25乘88加12除以5分之4=1.25*88+12*1.25=1.25*（88+12）=1.25*100=125

(1.6乘4)乘0.25加3.6除4=1.6乘4乘0.25加0.9=1.6乘1加0.9=1.6+0.9=2.5

101分之79乘102=(79/101)*(101+1)=79+79/101=79又79/101（7分之2加5分之1）乘7乘5=（2/7+1/5）*35=10+7=173.8乘4分之1+7.2除以4-

1/4*5+1/5*6+1/6*7+1/7*8=5/4+6/5+7/6+8/7=1+1/4+1+1/5+1+1/6+1+1/7=4+319/420=1999/420再问：要简单的算式过程。得数好像不是

7.2乘0.25加2.8除以4=7.2*0.25+2.8*0.25=0.25*（7.2+2.8）=0.25*10=2.5

4.9*4+5.1除以0.25=4.9*4+5.1*4=（4.9+5.1）*4=10*4=40

1/[n*(n+1)*(n+2)]=[1/n-1/(n+1)]/(n+2)=[1/n-1/(n+2)]/2-[1/(n+1)-1/(n+2)]=[1/n-2/(n+1)+1/(n+2)]/21/(1*

答案是9再问：过程再答：1×3×24+2×6×48+3×9×72=9×(1×2×4+2×4×8+3×6×12)再答：约分即可再答：分子每一个都是分母相应项的9倍再问：.....再问：要过程。再答：1×

5.23÷4/3+5.25x0.25=(5.25-0.02)x3/4+5.25x1/4=5.25x3/4+5.25x1/4-0.02x3/4=5.25(3/4+1/4)-0.015=5.235满意请点

(46+56)×(172÷4)+14=102×43+14=(100+2)×43+14=4300+86+14=4300+100=4400

1×2+3-4+5÷6÷7=1?