求31又2分之1x3分之2-41又3分之1x4分之3+51又4分之1x5分之4的简便运算
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原式变形得:
=31*(2/3)+(1/2)*(2/3)-41*(3/4)-(1/3)*(3/4)+51*(4/5)+(1/4)*(4/5)
=31*(2/3)+1/3-41*(3/4)-1/4+51*(4/5)+1/5
=30*(2/3)+1*(2/3)+1/3-40*(3/4)-1*(3/4)-1/4+50*(4/5)+1*(4/5)+1/5
=20+1-30-1+40+1
=20-30+40+1
=31
=31*(2/3)+(1/2)*(2/3)-41*(3/4)-(1/3)*(3/4)+51*(4/5)+(1/4)*(4/5)
=31*(2/3)+1/3-41*(3/4)-1/4+51*(4/5)+1/5
=30*(2/3)+1*(2/3)+1/3-40*(3/4)-1*(3/4)-1/4+50*(4/5)+1*(4/5)+1/5
=20+1-30-1+40+1
=20-30+40+1
=31
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