номер 84
1) (2&1/4+3&2/3):(8&1/2-1&2/5)×1,2=(2&3/12+3&8/12):(8&5/10-1&4/10)×1,2=5&11/12:7&1/10×1,2=71/12×10/71=6/5×1,2=6/5×7/2=21/5=4&1/5
номер 84
1) (2&1/4+3&2/3):(8&1/2-1&2/5)×1,2=(2&3/12+3&8/12):(8&5/10-1&4/10)×1,2=5&11/12:7&1/10×1,2=71/12×10/71=6/5×1,2=6/5×7/2=21/5=4&1/5