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a) 235 x 17 + 235 x 83 = 235 x (17 + 83) = 235 x 100 = 23 500
345 x 23 + 345 x 76 +345 = 345 x (23 + 76 + 1) = 345 x 100 = 34 500
125 x 9 x 8 x 12 = (125 x 8) x (9 x 12) = 1 000 x 108 = 108 000
b) 75 x 218 - 65 x 218 = 218 x (75 - 65) = 218 x 10 = 2 180
237 x 128 - 237 x 27 - 237 = 237 x (128 - 27 - 1) = 237 x 100 = 23 700
25 x 34 x 4 x 6 = (25 x 4) x (34 x 6) = 100 x 204 = 20 400
bài 1
a) 5x24x36/6x12x10
=5x12x2x6x6/6x12x5x2
=6
b)1/3x5/7+3/9x2/7
=1/3x5/7+1/3*2/7
=1/3x(5/7+2/7)
=1/3x(7/7)
=1/3x1
=1/3
k nha
\(\frac{1}{10}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{5}\cdot\frac{5}{4}\cdot\frac{4}{3}\cdot\frac{3}{2}=\frac{1}{10}\)
\(\frac{1}{10}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\times\frac{6}{5}\times\frac{5}{4}\times\frac{4}{3}\times\frac{3}{2}\)\(\frac{3}{2}\)
\(=\frac{1}{10}\times\left(\frac{2}{3}\times\frac{3}{2}\right)\times\left(\frac{3}{4}\times\frac{4}{3}\right)\times\left(\frac{4}{5}\times\frac{5}{4}\right)\times\left(\frac{5}{6}\times\frac{6}{5}\right)\)
\(=\frac{1}{10}\times1\times1\times1\times1\)
\(=\frac{1}{10}\)
#Chúc bạn học tốt !
#k cho mình nhé ?
a) \(\left(\frac{5}{12}+\frac{1}{4}\right)\cdot\frac{6}{4}=\left(\frac{5}{12}+\frac{3}{12}\right)\cdot\frac{3}{2}=\frac{8}{12}\cdot\frac{3}{2}\)\(=\frac{24}{24}=1\)
b) \(\left(\frac{5}{3}-\frac{7}{6}\right):\frac{2}{5}=\left(\frac{10}{6}-\frac{7}{6}\right):\frac{2}{5}=\frac{3}{6}:\frac{2}{5}\)\(=\frac{1}{2}:\frac{2}{5}=\frac{5}{4}\)
a.(5/12+1/4)+6/4
=(5/12+3/12)+6/4
=8/12+6/4
=8/12+18/12
=20/12
=5/3
b.(5/3-7/6):2/5
=(30/18-21/18):2/5
=9/18:2/5
=1/2:2/5
=1/2*5/2
=5/4
b.25x15x4x6
=(25x4)x(15x6)
=100x90
=9000
c.65x37+63x65
=65x(37+63)
=65x100
=6500
#Hok tốt
b.25 x 15 x 4 x 6 = ( 25 x 6 ) x ( 15 x 4 ) = 150 x 60 = 9000
c.65 x 37 + 63 x 65 = 65 x ( 37 + 63 ) = 65 x 100 = 6500
HT~
de chia het cho 5 thi hang don vi la 5
co 4 cach chon hang nghin
co 3 cach chon hang tram
co 2 cach chon hang chuc
vay co tat ca: 1 x 4 x 3 x 2 = 24 ( so )
co 24 so nen o cac hang : nghin , tram , chuc thi cac chu so 1;2;3;4 deu xuat hien 24 : 4 = 6 ( lan ). rieng chu so 5 xuat hien 24 lan o hang don vi
tong 24 so tren la :
( 1 + 2 + 3 + 4 ) * 6 * 1000 + ( 1 + 2 + 3 + 4 ) * 6 * 100 + ( 1 + 2 + 3 + 4 ) * 6 * 10 + 5 * 24 = 67720
=[345+1000]+5x[ 1035+ 690-345]
=1345+5x1725
=1345+8525
=9870