Ответ:
(2/7+5/21)×21=(6/21+5/21)×21=11/21×21/1 =11 (7/12-5/9)×12=(21/36-20/36)×12=1/36×12/1= 12/36=1/3 (3/8+5/12)×24=(9/24+10/24)×24=19/24×24=19 (8/11-3/22)×44=( 16/22-3/22)×44=13/22 ×44 =26
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Ответ:
(2/7+5/21)×21=(6/21+5/21)×21=11/21×21/1 =11 (7/12-5/9)×12=(21/36-20/36)×12=1/36×12/1= 12/36=1/3 (3/8+5/12)×24=(9/24+10/24)×24=19/24×24=19 (8/11-3/22)×44=( 16/22-3/22)×44=13/22 ×44 =26