Current location - Training Enrollment Network - Mathematics courses - Come on! Elementary school Su Jiaoban sixth grade first volume mathematics "basic training" p3 1 wide-angle thinking (homework tonight)
Come on! Elementary school Su Jiaoban sixth grade first volume mathematics "basic training" p3 1 wide-angle thinking (homework tonight)
Denominator 1 times 2/2 1 plus 2 times 3/3 1 plus 4 times 5 1,,, plus 39 times 40 1.

= 1- 1/2+ 1/2- 1/3+...+ 1/30- 1/40

= 1- 1/40

=39/40

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