a) A=625–(61–17).12+(27+27):17A=625–(61–17).12+(27+27):17

=625–528+3=100=625–528+3=100

b) B=−126–(42–5)2+870:29B=−126–(42–5)2+870:29

=−126–112+30=−126–112+30

=−126–121+30=−217

\(A=625-\left(61-17\right)\cdot12+\left(27+24\right)\div17\)

\(A=625-44\cdot12+51\div17\)

\(A=625-528+3\)

\(A=100\)

\(B=-126-\left(4^2-5^2\right)+870-29\)

\(B=-126-\left(16-25\right)+870-29\)

\(B=-126-\left(-9\right)+870-29\)

\(B=-117+870-29\)

\(B=753-29\)

\(B=724\)

           Chúc bn hok tốt

1) A \(=625-\left(61-17\right).12+\left(27+24\right):17\)

\(\Leftrightarrow A=625-44.12+51:17\)

\(\Leftrightarrow A=625-528+3\)

\(\Leftrightarrow A=100\)

Vậy A = 100

2) B \(=-126-\left(4^2-5^2\right)+870-29\)

\(\Leftrightarrow B=-126-\left(16-25\right)+870-29\)

\(\Leftrightarrow B=-126-16+25+870-29\)

\(\Leftrightarrow B=724\)

Vậy B = 724

a) \(A=625-\left(61-17\right).12+\left(27+24\right):17\)

\(=625-44.12+51:17\)

\(=625-528+3=100\)

b) \(B=-126-\left(4^2-5^2\right)+870-29\)

\(=-126-16+25+870-29\)

\(=724\)

bạn nào giúp mk với mk đang cần gấp

a/ A=625-(61-17)*12+(27+24)/17  

    A=625-44*12+51/17                                                       

    A=625-528+3

    A=97+3

   A=100

a) 5.(-8).(-2).(-3)

=5.[(-8).(-2).(-3)]

=5.(-48)

=-240

b)  4.(–5)² + 2.(–5) – 20

= 4.(-5)² + 2.(-5) - (-4)(-5)
= (-5).[4.(-5) + 2 - (-4)]
= (-5).[-20 + 2 + 4]
=(-5).(-14)
=70

c)  27.(15 –12) – 15.(27 –12)
= 27.15 - 27.12 - 15.27 + 15.12 
= (27.15 - 15.27) + (15.12 - 27.12)
= 0 + 15.12 - 27.12
= 12(15-27)
= 12.(-12)
= -144
 

a)125.(-24)+24.225

=(-125).24+24.225

=24.[(-125)+225]

=24.100

=2400

       Các câu khác bạn làm tương tự nha

a ) \(125\times\left(-24\right)+24\times225\)

\(=24\left[\left(-125\right)+225\right]\)

\(=24\times100\)

\(=2400\)

b ) \(26\times\left(-125\right)-125\times\left(-36\right)\)

\(=125\left[\left(-26\right)-\left(-36\right)\right]\)

\(=125\times10\)

\(=1250\)

\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)

\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)

\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)

\(=\frac{3}{5}\times1+\frac{6}{5}\)

\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)

~ Hok tốt ~

\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)

\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)

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

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

~ Hok tốt ~

\(\frac{2}{15}\times\frac{4}{7}+\frac{4}{7}\times\frac{2}{3}+\frac{4}{7}:5\)

\(=\frac{2}{15}\times\frac{4}{7}+\frac{4}{7}\times\frac{2}{3}+\frac{4}{7}\times\frac{1}{5}\)

\(=\left(\frac{2}{15}+\frac{2}{3}+\frac{1}{5}\right)\times\frac{4}{7}\)

\(=1\times\frac{4}{7}=\frac{4}{7}\)

~ Hok tốt ~