8у2/5: 5ц1/4+1ц17/46×3ц2/7: 3ц1/20-1ц4/5 - вопрос №5091365825514117463273120145 от gussamovadel 22.10.2022 12:36

Question

Математика: 8у2/5: 5ц1/4+1ц17/46×3ц2/7: 3ц1/20-1ц4/5

gussamovadel · Answer

8 2/5:5 1/4+1 17/46*3 2/7:3 1/20-1 4/5=1 84/305
1) 8 2/5:5 1/4=42/5:21/4=42/5*4/21=8/5=1 3/5
2) 1 17/46*3 2/7=63/46*23/7=9/2=4 1/2
3) 4 1/2:3 1/20=9/2:61/20=9/2*20/61=90/61=1 29/61
4) 1 3/5+1 29/61-1 4/5=1 29/61+(1 3/5-1 4/5)=1 29/61-1/5=1 145/305-61/305=1 84/305