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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
13/19 x 5/17 + 12/17 x 13/19
= 13/19 x (5/17 + 12/17)
= 13/19 x 1
= 13/19
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
= ( 1 + 12 ) + ( 2 + 11 ) + ( 3 + 10 ) + ( 4 + 9 ) + ( 5 + 8 ) + ( 6 + 7 )
= 13 + 13 + 13 + 13 + 13 + 13
= 13 x 6
= 78
sai thui
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
\(123+132+213+312+321\)
\(=\left(123+312\right)+\left(213+132\right)+321\)
\(=435+345+321\)
\(=\left(435+345\right)+321\)
\(=780+321=1101\)
123+132+213+231+312+321
=(123+321)+(213+132)+321
=435+345+321
=(435+345)+321
=780+321
=1101
199x101
=199x(100+1)
=199x100+199x1
=19900+199
=20099
Chúc bạn học tốt ~
\(A=132\times53+132\times47\)
\(\Leftrightarrow A=132\left(53+47\right)\)
\(\Leftrightarrow A=132\times100\)
\(\Leftrightarrow A=13200\)
\(\text{Vậy }A=13200\)
\(B=204\times13-204\times3\)
\(\Leftrightarrow B=204\left(13-3\right)\)
\(\Leftrightarrow B=204\times10\)
\(\Leftrightarrow B=2040\)
\(\text{Vậy }B=2040\)
A) 132*53+132*47
=132*(53+47)
=132*100
=13200
B) 204*13-204*3
=204*(13-3)
=204*10
=2040