a: \(32684+41325+316+675\)

\(=\left(32684+316\right)+\left(41325+675\right)\)

\(=33000+42000=75000\)

b: \(25\cdot18\cdot4\cdot2\)

\(=18\cdot2\cdot\left(25\cdot4\right)\)

\(=36\cdot100=3600\)

c: \(19\cdot81+19+18\cdot19\)

\(=19\left(81+1+18\right)\)

\(=19\cdot100=1900\)

^{A, 32684 + 41325 + 316 + 675}

^{=(32684+316)+(41325+675)}

=33000+42000

=75000

^{B, 25 x 18 x 4 x 2}

^{=(25x4)x(18x2)}

^=100x36

⁼³⁶⁰⁰

^{C, 19 x 81 + 19 + 18 x 19}

=19x(81+18+1)

=19x100

=1900

C bị sai đề bạn ơi

có đúng ko

a: \(=\dfrac{17}{19}\cdot\dfrac{19}{17}\cdot\dfrac{4}{5}=\dfrac{4}{5}\)

b: \(=\dfrac{14}{7}\cdot\dfrac{7}{6}=2\cdot\dfrac{7}{6}=\dfrac{14}{6}=\dfrac{7}{3}\)

c: =13/14(4/5+1/5)=13/14

\(\dfrac{17}{19}\times\dfrac{12}{15}\times\dfrac{19}{17}=\dfrac{12}{15}\)

\(\left(\dfrac{5}{7}+\dfrac{9}{7}\right)\times\dfrac{21}{18}=2\times\dfrac{7}{6}=\dfrac{7}{3}\)

\(\dfrac{4}{5}\times\dfrac{13}{14}+\dfrac{13}{14}\times\dfrac{1}{5}=\dfrac{13}{14}\)

\(\dfrac{17}{19}\times\dfrac{12}{15}\times\dfrac{19}{17}.\\ =\dfrac{17}{19}\times\dfrac{19}{17}\times\dfrac{12}{15}.\\ =1\times\dfrac{12}{15}=\dfrac{12}{15}.\\ \left(\dfrac{5}{7}+\dfrac{9}{7}\right)\times\dfrac{21}{18}.\\ =2\times\dfrac{7}{6}=\dfrac{7}{3}.\\ \dfrac{4}{5}\times\dfrac{13}{14}+\dfrac{13}{14}\times\dfrac{1}{5}.\\ =\left(\dfrac{4}{5}+\dfrac{1}{5}\right)\times\dfrac{13}{14}.\\ =1\times\dfrac{13}{14}.\\ =\dfrac{13}{14}.\)

ban tu lam di,luoi the

bai ki vay ,

8x9x4+6x7x12+19+4x18

=(8x9)x4+(6x12)x7+19x(18x4)

=72x4+72x7+19x72

=72x(19+7+4)

=72x30

=2160

8x9x4+6x7x12+19x4x18=2096

2096 NHA MINA

X = ( 1+10 ) * 10 / 2 = 11 * 10 / 2 = 110 / 2 = 55

X= (2+20) * 10 /2 = 110

X= (1+19)*10/2= 100

1+2+3+4+5+6+7+8+9+10= (10+1)X10 : 2 = 55

2+4+6+8+10+12+14+16+18+20 = (20+2)x10 : 2 = 110

1+3+5+7+9+11+13+15+17+19 = (19+1) x 10 : 2 = 100

x=55

x=110

x=100