a)53.(-15)+(-15).47

=(53+47).(-15)

=100.(-15)

=-1500

a) 53.(-15)+(-15).47

=53.[(-15)+(-15)].47

=53.(-30).47

=-1590.47

=-74730

\(\frac{-3}{14}\) - \(\frac{5}{-14}\)

= \(\frac{-3}{14}+\frac{5}{14}\)

= \(\frac{2}{14}\)

= \(\frac17\)

- \(\frac54\) - \(\frac34\)

= -(\(\frac54+\frac34\))

= - \(\frac84\)

= - 2

\(\frac{15}{6}-\frac{-10}{20}\)

= \(\frac52\) + \(\frac12\)

= \(\frac62\)

= 3

\(\frac{26}{-35}\) - \(\frac{6}{35}\)

= - (\(\frac{26}{35}\) + \(\frac{6}{35}\))

=- \(\frac{32}{35}\)

a,=4¹⁰

b,=3¹⁶

c,=3ⁿ

d,=10¹⁶

e,=...

a) \(16^6:4^2=\left(4^2\right)^6:4^2=4^{12}:4^2=4^{10}\)

b) \(27^8:9^4=\left(3^3\right)^8:\left(3^2\right)^4=3^{24}:3^8=3^{16}\)

c) \(12^n:2^{2n}=12^n:4^n=3^n\)

d) \(4^{14}\times5^{18}=\left(4^7\right)^2\times\left(5^9\right)^2=\left(4^7\times5^9\right)^2\)

Mình nghĩ đề thế này mới tính hợp lí được

2 ) B = \(1\frac{6}{41}.\left(\frac{12+\frac{12}{19}-\frac{12}{37}-\frac{12}{53}}{3+\frac{3}{19}-\frac{3}{37}-\frac{3}{53}}:\frac{4+\frac{4}{17}+\frac{4}{19}+\frac{4}{2006}}{5+\frac{5}{17}+\frac{5}{19}+\frac{5}{2006}}\right).\frac{124242423}{237373735}\)

B = 47/41 . ( 12/3 : 4/5 ) . 123/235

B = 47/41 . ( 4 : 4/5 ) . 123/235

B = 47/41 . 5 . 123/235

B = \(\frac{47.5.123}{41.235}\)

B = 3

1 ) A = \(\frac{636363.37-373737.63}{1+2+3+...+2006}\)

A = \(\frac{63.10101.37-37.10101.63}{1+2+3+...+2006}\)

A = \(\frac{0}{1+2+3+...+2006}\)

A = 0

a) \(22\frac{1}{2}\cdot\frac{7}{9}+50\%-1,25\)

\(=\frac{45}{2}\cdot\frac{7}{9}+\frac{50}{100}-\frac{125}{100}\)

\(=\frac{5}{2}\cdot\frac{7}{1}+\frac{1}{2}-\frac{5}{4}\)

\(=\frac{35}{2}+\frac{1}{2}-\frac{5}{4}=18-\frac{5}{4}=\frac{67}{4}\)

b) \(1,4\cdot\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}\)

\(=\frac{7}{5}\cdot\frac{15}{49}-\frac{22}{15}:\frac{11}{15}\)

\(=\frac{1}{1}\cdot\frac{3}{7}-\frac{22}{15}\cdot\frac{15}{11}\)

\(=\frac{3}{7}-2=\frac{3-14}{7}=\frac{-11}{7}\)

c) \(\left(-\frac{1}{2}\right)^2-\frac{7}{16}:\frac{7}{4}+75\%\)

\(=\frac{1}{4}-\frac{7}{16}\cdot\frac{4}{7}+\frac{75}{100}\)

\(=\frac{1}{4}-\frac{1}{4}+\frac{3}{4}=\frac{3}{4}\)

Bài 2  Bạn tự làm nhé

1.a,\(22\frac{1}{2}.\frac{7}{9}+50\%-1,25\)

\(=\frac{45}{2}.\frac{7}{9}+\frac{1}{2}-\frac{5}{4}\)

\(=\frac{35}{2}+\frac{1}{2}-\frac{5}{4}\)

\(=\frac{67}{4}\)

b,Các phép tính khác làm tương tự

Đổi các số ra hết thành phân số,có ngoặc thì lm ngoặc trc,Xoq đến nhân chia trước dồi mới cộng trừ

c,tương tự

2.

a,\(1\frac{3}{5}+\frac{7}{12}\div x=\frac{-9}{4}\)

\(\frac{8}{5}+\frac{7}{12}\div x=\frac{-9}{4}\)

\(\frac{7}{12}\div x=\frac{-77}{20}\)

Đến đây dễ bạn tự làm

b,\(\left(2\frac{4}{5}.x+50\right)\div\frac{2}{3}=-51\)

\(\left(\frac{14}{5}x+50\right)\div\frac{2}{3}=-51\)

\(\frac{14}{5}x+50=-34\)

\(\frac{14}{5}x=-84\)

Tự làm tiếp

c,\(\left|\frac{3}{4}.x-\frac{1}{2}\right|=\frac{1}{4}\)\(\Rightarrow\left|\frac{3}{4}x-\frac{1}{2}\right|=\varnothing\)

b)=(2/3 +2/7 - 2/28)/(-3/3 -3/7 + 3/28)

=[2(1/3+1/7-1/28)]/[(-3)(1/3+1/7-1/28)]

=2/-3 

=-2/3

\(=\frac{-\frac{1}{4}.-\frac{1}{5}}{\frac{5}{9}-\frac{13}{12}}\)

\(=\frac{\frac{1}{20}}{\frac{1}{4}}\)

\(=\frac{1}{20}:\frac{1}{4}\)

\(=\frac{1}{5}\)

a) \(9^8=\left(3^2\right)^8=3^{16}\)

\(27^3=\left(3^3\right)^3=3^9\)

\(81^2=\left(3^4\right)^2=3^8\)

\(\Leftrightarrow3^{16}:\left(3^9.3^8\right)\)

\(\Leftrightarrow3^{16}:3^{17}\)

\(\Leftrightarrow3^{-1}=\frac{1}{3}\)

a) 9^́́́8 : ̣(27³ . 81²)= 3^{16  :} 3⁹ . 3⁸ = 3¹⁵

Thực hiện phép tính :

\(13-12+11+10-9+8-7+6-5+4-3+2-1=17\)

Nhanh nhất đó, 3 k (tích) nha !

Ta có: 13-12+11+10-9+8-7-6+5-4+3+2-1

=(13-12)+(11+10-9+8)+(-7-6)+(5-4)+(3+2-1)

=1+20-13+1+4

=13

Câu 1 :

A= 1.2.3...9-1.2.3...8-1.2.3...8²

  = 1.2.3...8. ( 9 - 1 - 8 )

  = 1.2.3...8.0

  = 0

\(\frac{15\cdot12-15}{12-27}\)

\(=\frac{15\left[12-1\right]}{12-27}\)

\(=\frac{15\cdot11}{12-27}=\frac{3\cdot5\cdot1\cdot11}{3\cdot4-3\cdot9}=\frac{3\cdot5\cdot1\cdot11}{3\left[4-9\right]}=\frac{3\cdot5\cdot1\cdot11}{3\cdot(-5)}=\frac{5\cdot1\cdot11}{-5}=\frac{1\cdot1\cdot11}{-1}=-11\)

15(12-1)/-15=-11