256x254/255+254x1/255简便
256x254/255+254x1/255 数学题 怎么简算,以及7.2X14.5+17X2.8怎么简...
256x254/255+254x1/255=(255+1)(255-1)/255+(255-1)*1/255=(255^2-1)/255+(255-1)*1/255=255-1/255+1-1/255=256 7.2X14.5+17X2.8=(10-2.8)*14.5+17*2.8=145-2.8*14.5+17*2.8=145+2.8*(17-14.5)=145+2.8*2.5=145+7=15等会说。
= 254+508/255 = 254+1+253/255 =255+253/255 =255又253/255
256x254/255+254x1/255=(255+1)(255-1)/255+(255-1)*1/255=(255^2-1)/255+(255-1)*1/255=255-1/255+1-1/255=256 7.2X14.5+17X2.8=(10-2.8)*14.5+17*2.8=145-2.8*14.5+17*2.8=145+2.8*(17-14.5)=145+2.8*2.5=145+7=15等会说。
= 254+508/255 = 254+1+253/255 =255+253/255 =255又253/255
256x254/255+254x1/255=(255+1)x254/255+(255-1)x1/255=255x254/255+254/255+255x1/255-1/255=254+254/255+1-1/255=255+253/255=255又253/255 （1046+4/5+5/6+6/7）÷(4/5+5/6+6/7)=[2x210x（4/5+5/6+6/7）(4/5+5/6是什么。
256*254/255+254*1/255=254*（256+1）1/255=254+254*2/255=255又253/255
256x254/255+254x1/255 数学题 -
思路：256=255+1,254=255-1,则换算得：（255+1）×（255-1）255 + (255-1)/255,计算得：255-1/255)+(1-1/255)算得最后结果：256+2/255 第二题：7.2×2.9×5 + 17×2.9 - 17×0.1 =（7.2×5+17）×2.9-1.7 =53×2.9-1.7 =53×（3-0.1）1.7 =159-希望你能满意。
256× 254/255+254×1/255 =(256x254+1x254)/255 =257x254/255 =65278/255 你再仔细看看 是不是-号不是+号，
256x255/254+254x255/1简便计算? -
简便运算：256x255/254+254x255/1 =255x（256/254+254）255x64772/254 =16516860/254 =8258430/127 =65027又1/127
=10x14-9.9+3.6 =140-6.3 =133.7 256x254/255+254x1/255 =(256+1)x254/255 =257x(1-1/255)=257-257/255 =255又253/255 12.8x34.5+12.8x12.3+46.8x87.2 =12.8x(34.5+12.3)+46.8x87.2 =12.8x46.8+46.8x87.2 =(12.8+87.2)x46.8 =100x46.8 =4680 还有呢？
1. 256x255分之254+254x255分之1 2. 12.8 -
1． 256x255分之254＋254x255分之1 =256×255分之254＋255分之254=（256+1）×255分之254=257×（1-255分之1）257-255分之257 =257-1-255分之2 =256-255分之2 =255又255分之253 2． 12.8x34.5＋12.8x12.3+46.8x87.2 =12.8×（34.5＋12.3）46.8x87.2 到此结束了？。
（255+1）x（1-1/255） (255-1）x 1/255 = (255 x1 - 255 x 1/255 +1 - 1/255 ) + 255 x 1/255 - 1/255 = 256 - 2/255 = (256 x 255 -2 ) / 255