В каком случае сумма найдена неправильно? А) 3/7+1/8=3+1/7+8=4/15; В) 3/7+1/8=3+1/7*8=4/56;С) 3/7+1/8=3*15+1*15/7+8=45+15/15=60/15=4; D)3/7+1/8=3*8+1*7/7*8=24+7/56=31/56.


Срочно помогите дам 10 баллов​
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