1⼀2*4+1⼀4*6+1⼀6*8+...+1⼀98*100

2024-12-14 04:09:39
推荐回答(3个)
回答1:

1/2*4+1/4*6+1/6*8+...+1/98*100
=(1/2-1/4+1/4-1/6+1/6-1/8+……+1/98-1/100)÷2
=(1/2-1/100)÷2
=49/100÷2
=49/200

回答2:

1/2(1/2-1/4+1/4-1/6+....+1/98-1/100)=1/2(1/2-1/100)=49/200

回答3:

1/2*4+1/4*6+1/6*8+...+1/98*100
=(1/2-1/4+1/4-1/6+1/6-1/8+……+1/98-1/100)÷2
=(1/2-1/100)÷2
=49/100÷2
=49/200