1) 5÷1 1/4+7÷1 1/3 2) 6 6/11 ×3/4 ÷ 2 2/5 ×2 1/5 3) ( 7/ 12 - 8/15 )во второй степени + 4/5 × (7/10-9/16)

Пошаговое объяснение:

1) 5÷1 1/4+7÷1 1/3 =9 1/4

5÷1 1/4=5*4/5=4

7÷1 1/3 =7*3/4=21/4=5 1/4

4+5 1/4=9 1/4

2) 6 6/11 ×3/4 ÷ 2 2/5 ×2 1/5 =4 1/2

6 6/11 ×3/4= 72/11*3/4=54/11

54/11÷ 2 2/5=54/11*5/12=90/44

90/44×2 1/5 =90/44*11/5=4 1/2

3) ( 7/ 12 - 8/15 )² + 4/5 × (7/10-9/16)=9/80

( 7/ 12 - 8/15 )²=(35/60-32/60)²=(1/20)²=1/400

7/10-9/16=56/80-45/80=11/80

4/5*11/80=11/100

1/400+11/100=1/400+44/400=45/400=9/80