Ответы на вопрос:
А) (5/8 - 2/5) + 3/20=(25/40-16/40)+6/40=9/40+6/40=15/40=3/8 б) (3/4 + 1/8) - 5/8 = (6/8+1/8)-5/8=7/8-5/8=2/8=1/4
А)(5/8-2/5)+3/20=(25/40-16/40)+6/40=9/40+6/40=15/40 б)(3/4-1/8)-5/8=(6/8-1/8)-5/8=5/8-5/8=0
9x - 4x + 39 = 94 5x + 39 = 94 5x = 94 - 39 5x = 55 x = 55 : 5 x = 11 7y+2y-34=839y - 34 = 839y = 83 + 349y = 117y = 117 : 9y = 13
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