1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.2.49/(7777777*7777777)3.4649.05/0.7*1.6*0.4/3.2*1.54.1986-1983+1980-1977+…………+12-9+6-35.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*16.1-1/10-1/100-1/1000-1/10000-

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