Question

Đã trả lời bởi chuyên gia

Answer 1

1) [5 + 2× ( 9 – 2^3 )] : 7

= [5 + 2× 1 ] : 7

= 7 : 7

=1

2) 1,2 – 3^2 + 7,5 : 3

= 1,2 – 9 + 2,5
= -5,3
3) 9,8 + 1,5 × 6 + ( 6,8 – 2 ) : 3

= 9,8 + 9 + 4,8:3

= 9,8 + 9 +1,6

= 20,4
4) ( 2/3 + 1/6 ) : 5/4 + ( 1/4 + 3/8 ) : 5/2

= \frac{5}{6} : \frac{5}{4} + \frac{5}{8} : \frac{5}{2} = \frac{4}{6} + \frac{2}{8} = \frac{2}{3} + \frac{1}{4} = \frac{11}{12}

5) 5/9 : ( 1/11 – 5/22 ) + 7/4 × ( 1/14 –2/7)

= \frac{5}{9} : \frac{- 3}{22} + \frac{7}{4} \times \frac{- 3}{14} = \frac{5}{9} \times \frac{- 22}{3} + \frac{7}{4} \times \frac{- 3}{14} = \frac{- 110}{27} + \frac{- 3}{8} = \frac{- 961}{216}

6) –1,2 – ( –0,8 ) + 0,25 + 5,75 – 2021

= - 1, 2 + 0, 8 + 0, 25 + 5, 75 - 2021 = - 0, 4 + 6 - 2021 = 2026, 6

7) –0,1 + 16/9 + 11,1 + –20/9

= - 0, 1 + 11, 1 + \frac{16}{9} - \frac{20}{9} = 11 - \frac{4}{9} = \frac{95}{9}

8) 17/11 – ( 6/5 – 16/11 ) + 26/5

= \frac{17}{11} + \frac{16}{11} - \frac{6}{5} + \frac{26}{5} = \frac{33}{11} + \frac{20}{5} = 3 + 4 = 7

9) 39/5 + ( 9/4 – 9/5 ) – ( 5/4 + 6/7 )

= \frac{39}{5} - \frac{9}{5} + \frac{9}{4} - \frac{5}{4} - \frac{6}{7} = \frac{30}{5} + \frac{4}{4} - \frac{6}{7} = 6 + 1 - \frac{6}{7} = 7 - \frac{6}{7} = \frac{43}{7}

10) 32,125 – ( 6,325 + 12,125 ) – ( 37 + 13,675 )

= 32, 125 - 12, 125 - 6, 325 - 13, 675 - 37 = 20 - 20 - 37 = - 37

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Answer 2