)22,2: 5 5/7-2 3/5=? б)(7 1/4-6 7/18)*7,2+2,8=? - вопрос №348300522255723571467187228 от pashaShum12345 18.05.2022 16:30

Question

Математика: )22,2: 5 5/7-2 3/5=? б)(7 1/4-6 7/18)*7,2+2,8=?

pashaShum12345 · Answer

А)22,2:5 5/7-2 3/5=22,2:40/7-2,6=22,2*7/40-2,6=0,555*7-2,6=3,885-2,6=1,285

б)(7 1/4-6 7/18)*7,2+2,8=(7 9/36-6 14/36)*7,2+2,8=(1 9/36- 14/36)*7,2+2,8=
=(1 - 5/36)*7,2+2,8=31/36*7,2+2,8=31*0,2+2,8=6,2+2,8=9