a)  5 69 : 5 67 - 3 40 : 3 39  = 5 2 - 3 1  = 25 – 3 = 22

a) 5 69   :   5 67   –   3 40   :   3 39   =   5 2   –   3 1  = 25 – 3 = 22

b) 155 – [ 2 . ( 30 + 5 – 26 ) . ( 24 : 3 )]

= 155 – [ 2 . 9 . 8 ] = 155 – 144 = 11

c) 37 . 143 + 37 . 57 + 1300

= (37 . 143 + 37.57) + 1300

= 37.(143+ 57) + 1300

= 37. 200 + 1300

= 7400 + 1300

8700.

569:567-340:339

=

569 : 567 - 340 : 339

= 1.0035273368606 - 1.0029498525073

= 0.0005774843533

Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

k nhé

=\(\frac{37}{64071}\)

hok tốt nha

Bài 1 :

\(a,569:569-340:339\)

=\(1-\frac{340}{339}\)

=\(-\frac{1}{339}\)

\(b,155-\left[2.\left(30+5-26\right).\left(24:2\right)\right]\)

=\(155-\left[2.9.12\right]\)

=\(155-216\)

=\(-61\)

\(c,37.143+37.57+1300\)

=\(37.\left(143+57\right)+1300\)

=\(37.200+1300\)

=\(7400+1300\)

=\(8700\)

Bài 2 :

\(95-5x=23+18:9\)

=>\(95-5x=23+2=25\)

=>\(5x=95-25=70\)

=>\(x=70:5=14\)

Vậy x ∈ {14}

Đáp án cần chọn là: B

\(a,\dfrac{3^{43}+3^4}{3^{39}+1}\)

\(=\dfrac{3^4\cdot\left(3^{39}+1\right)}{3^{39}+1}\)

\(=3^4\)

\(=81\)

\(b,\dfrac{3^{10}.11+3^{10}.5}{3^9.2^4}\)

\(=\dfrac{3^{10}\left(11+5\right)}{3^9.2^4}\)

\(=\dfrac{3^{10}.16}{3^9.2^4}\)

\(=\dfrac{3^{10}.2^4}{3^9.2^4}=3\)

\(A=\frac{2}{2.5}+\frac{2}{5.8}+\frac{2}{8.11}+...+\frac{2}{17.20}+\frac{2}{20.23}\)

\(\frac{3A}{2}=\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}+...+\frac{3}{17.20}+\frac{3}{20.23}\)

\(\frac{3A}{2}=\frac{5-2}{2.5}+\frac{8-5}{5.8}+\frac{11-8}{8.11}+...+\frac{20-17}{17.20}+\frac{23-20}{20.23}\)

\(\frac{3A}{2}=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{17}-\frac{1}{20}+\frac{1}{20}-\frac{1}{23}=\frac{1}{2}-\frac{1}{23}=\frac{21}{46}\)

\(A=\frac{21.2}{46.3}=\frac{7}{23}\)

Mình trả lời trong tin nhắn rồi xem có đúng không nhé

\(=\frac{7}{23}\)

26.66+34.66-280

= 66.(26+34)-280

=66.60 -280

= 3960-280

= 3680