tìm a

a=2 mũ 41 nhân 5 mũ 38 

 a = 2⁴¹ . 5³⁸

a) \(\frac{637\times527-189}{526\times637+448}\)

\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)

\(=\frac{637\times526+637-189}{526\times637+448}\)

\(=\frac{637+526+448}{526\times637+448}\)

\(=1\)

b) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)

\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)

\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)

\(=\frac{50\times152}{19\times200}\)

\(=\frac{152}{19\times4}\)

\(=\frac{38}{19}\)

\(=\frac{2}{1}\)

\(=2\)

\(\frac{64X50+44X100}{27X38+146X19}=\frac{64X50+44X2X50}{27X2X38+146X19}=\frac{64X50+88X100}{54X38+146X19}=\frac{50X\left(64+88\right)}{19X\left(54+146\right)}=\frac{50X152}{19X200}\)\(=\frac{̸5̸̸0X152}{19X4X̸5̸0}=\frac{152}{76}=2\)                                                                                                                                                                                                                                          Đáp số :2

=2

HỌC TỐT NHA

64x100+50x44

=2200+6400

=8600

1026+2774

=3800

mình làm đúng ko vậy

TL:
= 3800

nhé

K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN

~~HT~~
 

Cho A = (100·44 + 50·60)·(37414,81000 + 2242,52100)

B = (16·14,96·25)·(27·38 + 19·146)

A = (100·44 + 50·2·30)·(3741,48·1100 + 2242,52·1100)

A = 100.(44 + 30).(3741,48 + 2242,52)·1100

A = 7400·5984·1100 A = 74·5984

B = (16·14,96·25)·(27·38 + 19·146)

B = (4·4·14,96·25)·(27·2·19 + 19·146)

B = 100·4·14,96 + 19.(146 + 54)

B = 1496·4 + 19·200 

B=5984*19*200

==>AB=5984*745984*19*200

AB=7419*200

AB=3719*100(giảm hai vế đi hai lần)

=>A;B=37/1900

chúc bn học tốt

Ta có: \(\frac{1}{10.11}+\frac{1}{11.12}+....+\frac{1}{49.50}\)

\(\Rightarrow\frac{1}{10}-\frac{1}{11}+\frac{1}{11}-\frac{1}{12}+....+\frac{1}{49}-\frac{1}{50}\)

\(=\frac{1}{10}-\frac{1}{50}\)

\(=\frac{2}{25}\)

=> 2/25

dài lắm bạn ơi

mình ko biết

\(\frac{1}{1.3.7}+\frac{1}{3.7.9}+\frac{1}{7.9.13}+\frac{1}{9.13.15}+\frac{1}{13.15.19}\)

\(=\frac{1}{2}\left(\frac{1}{1.3}-\frac{1}{3.7}+\frac{1}{3.7}-\frac{1}{7.9}+...+\frac{1}{13.15}-\frac{1}{15.19}\right)\)

\(=\frac{1}{2}\left(\frac{1}{1.3}-\frac{1}{15.19}\right)=\frac{47}{285}\)

Câu hỏi là:

HÃY TÍNH NHANH TỔNG SAU

0,12

0,05

0,306

TL:

\(\frac{12}{100}\)= 0,12

\(\frac{5}{100}\)= 0,05

\(\frac{306}{1000}\)= 0,306

-HT-