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解:7 4/5 + 77 4/5 +777 4/5 +1/5 X 3
=7 4/5 +1/5 +77 4/5 +1/5 +777 4/5+1/5
=8+78+778
=864
(224 + 1/222 ) X 1/223
=(223+1+ 1/222)×1/223
=(223 +223/222)× 1/223
=223 × 1/223 + 223/222 × 1/223
=1+1/222
=1又 222分之1
=7 4/5 +1/5 +77 4/5 +1/5 +777 4/5+1/5
=8+78+778
=864
(224 + 1/222 ) X 1/223
=(223+1+ 1/222)×1/223
=(223 +223/222)× 1/223
=223 × 1/223 + 223/222 × 1/223
=1+1/222
=1又 222分之1
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