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(2/3+5/12)×24
=24x2/3+24x5/12
=16+10
=26
(8/9+21/36)×36
=36x8/9+36x21/36
=32+21
=53
(6/7+5/21 )×21
=21x6/7+21x5/21
=18+5
=23
98×2/97
=(97+1)x2/97
=97x2/92+2/97
=2+2/97
=2又2/97
=24x2/3+24x5/12
=16+10
=26
(8/9+21/36)×36
=36x8/9+36x21/36
=32+21
=53
(6/7+5/21 )×21
=21x6/7+21x5/21
=18+5
=23
98×2/97
=(97+1)x2/97
=97x2/92+2/97
=2+2/97
=2又2/97
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