6道奥数题  1.50×84/89+46*42/89+84*26/89
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1.50×84/89+46*42/89+84*26/89

=50×84/89+23×84/89+84×26/89

=84/89(50+23+26)

=84*99/89

=8316/89

2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125

=13又 4/19+86又 15/19(*0.25+0.625+0.125)

=13又 4/19+86又 15/19*1

=13+86+4/19+15/19

=99+1

=100

3.77*1/8+7/8*23又 10/13+7/13*3/8

=11*7/8+7/8*23又 10/13+7/8*3/13

=7/8(11+23+10/13+3/13)

=7/8*(35)

=245/8

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