4×2/11+4×2/5+2×1/51+7×2/11
=(4×2/11+7×2/11)+4×2/5+2×1/51
=(4+7)×2/11+(8/5+2/51)
=11×2/11+(1+153/255+10/255)
=2+1+163/255
=3又163/255
4×2/11+4×2/5+2×1/51+7×2/11
=(2/11）x(4+7)+8/5+2/51
=2+1+3/5+2/51
=3+153/255+10/255
=3+163/255
=3又255分之163
4×2/11+4×2/5+2×1/5+7×2/11
=(4+7)×2/11+(8/5+2/5)
=2+2
=4
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