Question

31又2分之1*3分之1+41又3分之1*4分之1+51又4分之1*5分之1 简便运算

Answer 1

=(30+1 1/2)*1/3+(40+1 1/3)*1/4+(40+1 1/4)*1/5

=10+(3/2)*(1/3)+10*(4/3)(1/4)+10+(5/4)(1/4)

=30+1/2+1/3+1/4

=30+13/12

=31 1/12