Вычислите: 1){3/4+1/5}*5/15= 2){12 1/3-7 3/4}*6/11= - вопрос №134155152121373461132355819345833865 от mansurevk2005 02.02.2020 13:05

Question

Математика: Вычислите: 1){3/4+1/5}*5/15= 2){12 1/3-7 3/4}*6/11= 3){2 3/5-5/8}/19 3/4=

mansurevk2005 · Answer

1)3/4+1/5=15/20+4/20=19/2019/20×5/15=19/602)12 1/3-7 3/4=12 4/12-7 9/12==11 16/12-7 9/12=4 7/124 7/12×6/11=55/12×6/11=5/2==2 1/23)2 3/5-5/8=2 24/40-25/40==1 64/40-25/40=1 39/401 39/40÷19 3/4=79/40÷79/4==79/40×4/79=1/10...