4.75x4又3/4+4有3/4+4又3/4x4又1/4= 3/4x58+58除以4-64x1/4= 73.8除以9+73.8除以1又1/8= 666.66x7778+333.33x4444= (1+1/2+1/3+1/4+1/5)x(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)x(1/2+1/3+1/4+1/5)=用簡便算灋哦

4.75x4又3/4+4有3/4+4又3/4x4又1/4= 3/4x58+58除以4-64x1/4= 73.8除以9+73.8除以1又1/8= 666.66x7778+333.33x4444= (1+1/2+1/3+1/4+1/5)x(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)x(1/2+1/3+1/4+1/5)=用簡便算灋哦

.75x4又3/4+4有3/4+4又3/4x4=(75+1+4)*4又3/4=80*4+80*3/4=320+60=3803/4x58+58除以4-64x1/4=1/4*58*3+1/4*58-64*1/4=1/4*(164+58-64)=1/4*158=39.5 73.8除以9+73.8除以1又1/8=73.8*1/9+73.8*8/9=73.8*(1/9+8/9…