\(\left|-34\right|+(-4)\cdot(-1)^{2008}+(17-19)^2\)

\(=34+4+(-2)^2\)

\(=34+4+4\)

\(=42\)

\((-31)\cdot81-18\cdot31-31\)

\(=31\cdot(-81)-18\cdot31-31\)

\(=31\cdot(-81)-18-1\)

\(=31\cdot(-100)=-3100\)

\(3420-(125+3420)+(-25+74)\)

\(=3420-125+3420-25+74\)

\(=3420+125-3420+25+74\)

\(=3420+(-3420)-125-25+74=-76\)

P/S : Hông chắc :< Hoq chắc :> Còn ba bài đó bạn tự  làm đi

   \(\dfrac{25}{100}\) + \(\dfrac{1}{4}\) x 29 + 25% \(\times\) 30 + 0,25 \(\times\) 40

= 0,25+ 0,25 x 29 + 0,25 x 30 + 0,25 x 40

= 0,25 x ( 1 + 29 + 30 + 40)

= 0,25 x 100

= 25

 \dfrac{25}{100}10025​ + \dfrac{1}{4}41​ x 29 + 25% $\times$ 30 + 0,25 $\times$ 40

= 0,25+ 0,25 x 29 + 0,25 x 30 + 0,25 x 40

= 0,25 x ( 1 + 29 + 30 + 40)

= 0,25 x 100

= 25

\(\frac{1}{4}\times45+0,25\times35+\frac{25}{100}\times19+25\%\)

\(=0,25\times45+0,25\times35+0,25\times19+0,25\)

\(=0,25\times\left(45+35+19+1\right)\)

\(=0,25\times100=25\)

a: \(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\dfrac{19}{32}+\dfrac{13}{32}=1+1+1=3\)

b: \(=35\cdot1.1\cdot25\cdot\left(7,5-7,5\right)=0\)

a: =(34+14)+(1821+321)+1932+1332=1+1+1=3=(43​+41​)+(2118​+213​)+3219​+3213​=1+1+1=3

b: $=35\cdot 1.1\cdot 25\cdot \left(7,5-7,5\right)=0$

a, A là   cộng theo số lẻ ( 1 + 3 = 4 ,4 + 5 = 9.....) bắt đầu từ 3 

b , B là mỗi lần cộng thêm 6 

c , A là cộng theo số lẻ ( 1 + 3 = 4 ,4 + 5 = 9.....)

d, B là cộng theo số chẵn bắt đầu từ 4 

hok tốt

\(\frac{1}{4}\cdot45+0.25\cdot35+\frac{25}{100}\cdot19+25\%\)

\(=0.25\cdot45+0.25\cdot35+0.25\cdot19+0.25\)

\(=0.25\left(45+35+19+1\right)\)

\(=0.25\cdot100\)

\(=25\)

\(=0,25.45+0,25.35+0,25.19+0,25.1\)

\(=0,25.\left(45+35+19+1\right)\)

\(=0,25.100\)

\(=25\)

\(\dfrac{7}{19}x\dfrac{8}{23}+\dfrac{7}{19}x\dfrac{15}{23}+1\dfrac{7}{19}\)

= \(\dfrac{7}{19}x\left(\dfrac{8}{23}+\dfrac{15}{23}\right)+1+\dfrac{7}{19}\)

=\(\dfrac{7}{19}x1+1+\dfrac{7}{19}\)

= \(\dfrac{7}{19}+1+\dfrac{7}{19}=1\dfrac{14}{19}\) = \(\dfrac{33}{19}\)

\(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{3}{21}-\dfrac{17}{32}\)

=  \(\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{1}{7}-\dfrac{17}{32}\)

= \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{49}{32}-\dfrac{17}{32}\right)\)

= 1 + 1 + 1 = 3

\(\dfrac{8}{9}x\dfrac{15}{16}x\dfrac{24}{25}x\dfrac{35}{36}x\dfrac{48}{49}x\dfrac{63}{64}\)

= \(\dfrac{3}{4}\) *Câu này bạn tự sử dụng gạch nhé!

`1,`

`a,`

`7/19 \times 8/23 + 7/19 \times 15/23 + 1 7/19`

`= 7/19 \times 8/23 + 7/19 \times 15/23 + 1 + 7/19`

`= 7/19 \times (8/23 + 15/23 + 1) + 1`

`= 7/19 \times 2 + 1`

`=14/19 + 1`

`= 33/19`

`b,`

`75/100 + 18/21 + 49/32 + 1/4 + 3/21 - 17/32`

`= 75/100 + (18/21 + 3/21) + (49/32 - 17/32) + 1/4`

`= 0,75 + 1 + 1 + 0,25`

`= (0,75 + 0,25) + 1 + 1`

`= 1+1+1=3`

`c,`

`8/9 \times 15/16 \times 24/25 \times 35/36 \times 48/49 \times 63/64`

`=` \(\dfrac{2\times3}{3\times3}\times\dfrac{3\times5}{4\times4}\times\dfrac{3\times4\times2}{5\times5}\times\dfrac{5\times7}{6\times6}\times\dfrac{6\times8}{7\times7}\times\dfrac{7\times9}{8\times8}\)

`= 3/4` (bạn sử dụng gạch, rút gọn các số là được nhé).

a.
(5/11 + 6/11 ) + ( 1/4 +3/4) + ( 6/25 + 9/25)
= 11/11 + 4/4 + 15/25
= 1 +1 + 3/5
= 2+3/5 = 13/5
b.
( 37/100 + 163/100) + (1/8 + 3/8 ) + 19/4 + 1/2
=  200/100 + 4/8 + ( 19/4 + 2/4)
=    2 + 1/2 + 21/4
=  31/4