а)(3/4 + 1/6) × 3 + (5/6 - 1/2) ÷ 2/9= (9/12 + 2/12) × 3 + (5/6 - 3/6) ÷ 2/9= 11/12 × 3 + 2/6 ÷ 2/9= 33/12 + 2/6 × 9/2= 33/12 + 18/12= 51/12= 4 3/12= 4 1/4
б)(1 1/5 + 2 3/10) ÷ 1/2 + (6 3/4 - 2 2/3) ÷ 1 1/6= (6/5 + 23/10) ÷ 1/2 + (27/4 - 8/3) ÷ 7/6= (12/10 + 23/10) ÷ 1/2 + (81/12 - 32/12) ÷ 7/6= 35/10 ÷ 1/2 + 49/12 ÷ 7/6= 35/10 × 2 + 49/12 × 6/7= 70/10 + 294/84= 7 + 3.5= 10.5
а)
(3/4 + 1/6) × 3 + (5/6 - 1/2) ÷ 2/9
= (9/12 + 2/12) × 3 + (5/6 - 3/6) ÷ 2/9
= 11/12 × 3 + 2/6 ÷ 2/9
= 33/12 + 2/6 × 9/2
= 33/12 + 18/12
= 51/12
= 4 3/12
= 4 1/4
б)
(1 1/5 + 2 3/10) ÷ 1/2 + (6 3/4 - 2 2/3) ÷ 1 1/6
= (6/5 + 23/10) ÷ 1/2 + (27/4 - 8/3) ÷ 7/6
= (12/10 + 23/10) ÷ 1/2 + (81/12 - 32/12) ÷ 7/6
= 35/10 ÷ 1/2 + 49/12 ÷ 7/6
= 35/10 × 2 + 49/12 × 6/7
= 70/10 + 294/84
= 7 + 3.5
= 10.5