cặc mẹ mày

\(45.\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{7272}\right)\)

\(=45.\left(\frac{101.73}{101.30}+\frac{101.73}{101.42}+\frac{101.73}{101.56}+\frac{101.73}{101.72}\right)\)

\(=45.\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{72}\right)\)

\(=45.\left(\frac{73}{5.6}+\frac{73}{6.7}+\frac{73}{7.8}+\frac{73}{8.9}\right)\)

\(=45.73.\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)

\(=45.73.\left(\frac{1}{5}-\frac{1}{9}\right)\)

\(=45.73.\frac{4}{45}\)

\(=73.4\)

\(=292\)

\(45\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{7272}\right)\)

\(=45\left(\frac{73.101}{30.101}+\frac{73.101}{42.101}+\frac{73.101}{56.101}+\frac{73.101}{72.101}\right)\)

\(=45\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{42}\right)\)

\(=45.73\left(\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)\)

\(=45.73\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)

\(=45.73\left(\frac{1}{5}-\frac{1}{9}\right)\)

\(=45.73\left(\frac{9}{45}-\frac{5}{45}\right)\)

\(=45.73.\frac{4}{45}\)

\(=292\)

\(B=45.\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{9090}\right)\)

\(B=45.\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{90}\right)\)

\(B=45.73.\left(\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{90}\right)\)

\(B=3285.\left(\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{9.10}\right)\)

\(B=3285.\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{90}\right)\)

\(B=3285.\left(\frac{1}{5}-\frac{1}{8}+\frac{1}{90}\right)\)

\(B=3285.\frac{31}{360}=\frac{2263}{8}\)

bn xem lại đề đi nhé

mình thiếu

Tính nhanh

2020×28+74×2020-4040

= 2020 x 28 + 74 x 2020 - 2020 x 2

= 2020 x (28+74 - 2)

= 2020 x 100

= 202 000

(:

dell

8888 x 85 + 10 x 8888 x 6 - 8888

= 8888 x (85+10-1) x 6

= 8888 x 94 x 6 = 5012832 mk nghĩ v á chứ còn muốn nhanh với thuận tiện nhất thì dùng máy tính là đc r (đùa thôi:))

=15/23.(69/54./27/15)

=15/23.23/10

=3/2

\(=\dfrac{15}{23}\times\dfrac{69}{54}\times\dfrac{27}{15}\\ =\dfrac{3}{2}\)

=15/23 x (69/54 x /27/15)

=15/23 x 23/10

=3/2

2020*14+4040*16+6060*18

= 1010*2*14+1010*4*16+1010*6*18

=1010*28+1010*64+1010*108

=1010*(28+64+108)

=1010*200=202000

= 2020 * 14 + 2020 * 2 * 16 + 2020 * 3 * 18

= 2020 * 14 + 2020 * 32 + 2020 * 54

=2020 * (14 + 32 + 54)

=2020 * 100

=20200

cảm ơn bạn. bạn có thể giúp mình thêm 1 bài ko?

9999 x 9999 - 9999 + 9999 * 9999=199950003

8888 x 8888 - 8888 + 8888 * 8888 =78987656

7777 x 7777 - 7777 + 7777 * 7777 =120955681

9999 x 9999 - 9999 + 9999 * 9999=199950003

8888 x 8888 - 8888 + 8888 * 8888 =157984200

7777 x 7777 - 7777 + 7777 * 7777 =120955681

1)199950003

2)78996544

3)120955681