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\(A=\dfrac{2}{3}+\dfrac{2}{6}+\dfrac{2}{12}+...+\dfrac{2}{192}\)
=>\(2A=\dfrac{4}{3}+\dfrac{2}{3}+\dfrac{2}{6}+...+\dfrac{2}{96}\)
=>\(2A-A=\dfrac{4}{3}-\dfrac{2}{192}\)
=>A=4/3-1/96=127/96
376 x 29 + 70 x 376 + 376
= 376 x 29 + 70 x 376 + 376 x 1
= 376 x (29 + 70 + 1)
= 376 x 100
= 37600
Sửa đề:
376 × 29 + 70 × 376 + 376
= 376 × (29 + 70 + 1)
= 376 × 100
= 37600
199x101
=199x(100+1)
=199x100+199x1
=19900+199
=20099
Chúc bạn học tốt ~
\(\dfrac{9}{10}\times2+3\times\dfrac{9}{10}+\dfrac{9}{10}:\dfrac{1}{5}\)
\(=\dfrac{9}{10}\times2+\dfrac{9}{10}\times3+\dfrac{9}{10}\times5\)
\(=\dfrac{9}{10}\times\left(2+3+5\right)\)
\(=\dfrac{9}{10}\times10\)
\(=\dfrac{90}{10}\)
\(=9\)
9+3+2+1+7+8+5+10+6+4= (9+1)+(2+8)+(3+7)+(4+6)+5=10+10+10+10+5=10.4+5=40+5=45
20,1 - 23,45 + 13,45
= ( 23,45 + 13,45 ) - 20,1
= 36,9 - 20,1
= 16,8
\(\left(1-\frac{1}{12}\right).\left(1-\frac{1}{11}\right).\left(1-\frac{1}{10}\right).\left(1-\frac{1}{9}\right).\left(1-\frac{1}{8}\right)\)
\(=\left(\frac{12}{12}-\frac{1}{12}\right).\left(\frac{11}{11}-\frac{1}{11}\right).\left(\frac{10}{10}-\frac{1}{10}\right).\left(\frac{9}{9}-\frac{1}{9}\right).\left(\frac{8}{8}-\frac{1}{8}\right)\)
\(=\frac{11}{12}.\frac{10}{11}.\frac{9}{10}.\frac{8}{9}.\frac{7}{8}\)
\(=\frac{11.10.9.8.7}{12.11.10.8.9}\)
\(=\frac{7}{12}\)
Chúc bạn học tốt !!!
\(\left(1-\frac{1}{12}\right)\left(1-\frac{1}{11}\right)\left(1-\frac{1}{10}\right)\left(1-\frac{1}{9}\right)\left(1-\frac{1}{8}\right)\)
\(=\frac{11}{12}.\frac{10}{11}.\frac{9}{10}.\frac{8}{9}.\frac{7}{8}\)
\(=\frac{11.10.9.8.7}{12.11.10.9.8}\)
\(=\frac{7}{12}\)
\(A=132\times53+132\times47\)
\(\Leftrightarrow A=132\left(53+47\right)\)
\(\Leftrightarrow A=132\times100\)
\(\Leftrightarrow A=13200\)
\(\text{Vậy }A=13200\)
\(B=204\times13-204\times3\)
\(\Leftrightarrow B=204\left(13-3\right)\)
\(\Leftrightarrow B=204\times10\)
\(\Leftrightarrow B=2040\)
\(\text{Vậy }B=2040\)
A) 132*53+132*47
=132*(53+47)
=132*100
=13200
B) 204*13-204*3
=204*(13-3)
=204*10
=2040
348 : 2 + 76 - 48 : 2 + 24
= ( 348 : 2 - 48 : 2 ) + ( 76 + 24 )
= ( 348 - 48 ) : 2 + 100
= 300 : 2 + 100
= 150 + 100
= 250
Tính bằng cách thuận tiện nhất:
348 : 2 + 76 - 48 : 2 + 24
= ( 348 - 48 ) : 2 + ( 76 + 24 )
= 300 : 2 + 100
= 150 + 100
= 250
Hok tốt