Question

resolva as expressões abaixo
a) 1/4+3/6-2/5
b)(1/8+2/5): (3/7-1/4).(2/9+1/2)​

Answer 1

a) 1/4 + 3/6 - 2/5

1.6+3.4/4.6 - 2/5

18/24 - 2/5

18.5-2.24/24.5

90-48/120

42/120

7/20

b) (1/8 + 2/5) ÷ (3/7 - 1/4) × (2/9 + 1/2)

(1.5+2.8/8.5) ÷ (3.4-1.7/7.4) × (2.2+1.9/2.9)

(5+16/40) ÷ (12-7/28) × (4+9/18)

21/40 ÷ 5/28 × 13/18

7/40 × 28/5 × 13/6

7/10 × 7/5 × 13/6

7×7×13/10×5×6

637/300