二分之一加六分之一加十二分之一加二十分之一等于多少

网友回答

=1/2+1/2*3+1/3*4+1/4*5
=1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=4/5======以下答案可供参考======
供参考答案1:
1/2+1/6+1/12+1/20
=30/60+10/60+5/60+3/60
=48/60
=4/5供参考答案2:
=1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=4/5供参考答案3:
=1/2+1/2*3+1/3*4+1/4*5
=1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=4/5