A = 3280 - (9.343-8.49) = 3280 - (3087-392) = 3280 - 2695 = 585

B = 136.25+75.136-36.100 = 3400+10200-3600 = 13600-3600 = 1000

C = (15.177147+4.531441):(2187.25) = (2666205+2125764):54675 = 4791969:54675 = 2180439

D = Không làm đc Mong bạn thông cảm ^-^

NHANH LÊN 

LÂU QUÁ

a) 32 : 8 x 3 = 4 x 3 = 12

b) 45 x 2  x 5 = 90 x 5 = 450

c) 49  x 4 : 7 = 196 : 7 = 28

d) 234 : 6 : 3 = 39  : 3 = 13

\(\frac{\left(\frac{3}{15}+\frac{1}{4}+\frac{7}{20}\right)\times\frac{17}{49}}{5\frac{1}{3}+\frac{2}{5}}\)

\(=\frac{\left(\frac{12}{60}+\frac{15}{60}+\frac{21}{60}\right)\times\frac{17}{49}}{\frac{16}{3}\times\frac{2}{5}}\)

\(=\frac{\frac{48}{60}\times\frac{17}{49}}{\frac{80}{15}+\frac{6}{15}}\)

\(=\frac{\frac{816}{2940}}{\frac{86}{15}}\)

\(=\frac{816}{2940}:\frac{86}{15}\)

\(=\frac{816}{2940}\times\frac{15}{86}\)

\(=\frac{68}{245}\times\frac{15}{86}\)

\(=\frac{102}{2107}\)

(140 x \(\frac{7}{3}\) - 138 x \(\frac{5}{12}\)) : \(\frac{49}{6}\)=

=\(:\frac{49}{6}\)

=  (\(\frac{1960}{6}-\frac{345}{6}\)  ) :\(\frac{49}{6}\)

=\(\frac{1615}{6}:\frac{49}{6}\)

=\(\frac{1615}{49}\)

a,( 3⁹³+3⁹⁰) : (3¹⁷. 3⁷³)

= (3³+1). 3⁹⁰ : 3⁹⁰

= 3³+1

=27+1

=28

b,(5⁵⁶+5⁷) : (5⁴⁹+1)

=5⁷. (5⁴⁹+1) : (5⁴⁹+1)

=5⁷= 78125

c,(7²²+7²¹+7²⁰) ; (2⁵+2⁴+3²)

= 7²⁰. (7²+7¹+1) : [2⁴. (2+1)+3² ]

= 7²⁰. 57 : [ 2⁴. 3 +3² ]

= 7²⁰. 57 :  ( 2⁴+3) . 3

= 7²⁰. 57 :  19 . 3

= 7²⁰. 57 : 57

= 7²⁰