3+3+2+5+1
tính nhanh nhất
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Lời giải:
\(=(4\frac{2}{5}-2\frac{2}{5})+(2\frac{3}{7}+5\frac{4}{7})\)
\(=(4-2)+(\frac{2}{5}-\frac{2}{5})+(2+5)+(\frac{3}{7}+\frac{4}{7})=2+0+7+1=10\)
` = ( 22/5 + 17/7 ) + ( 39/7 - 12/5 ) = 22/5 + 17/7 + 39/7 - 12/5 = ( 22/5 - 12/5 ) + ( 17/7 + 39/7 ) = 10/5 + 56/7 = 2 + 8 = 10 `
\(A=\frac{1}{n}-\frac{1}{n+1}+\frac{1}{n+1}-\frac{1}{n+2}+...+\frac{1}{n+5}-\frac{1}{n+6}\)
\(A=\frac{1}{n}-\frac{1}{n+6}\)
\(A=\frac{6}{n\left(n+6\right)}\)
1
a ( 1/3 +2/5) *3/4 = ( 5/15+6/15) *3/4 = 11/15 *3/4 = 11/20
( 1/3 + 2/5)* 3/4 = 1/3*3/4 + 2/5* 3/4 = 1/4 + 3/10 = 5/20 + 6/20 = 11/20
b ( 7/9 +2/3) :(5/6) = ( 7/9+6/9) :(5/6) = 13/9 :(5/6) = 13/9 * 6/5 = 26/15
( 7/9 +2/3) :(5/6) = ( 7/9+2/3) *(6/5) = 7/9 * 6/5 + 2/3 *6/5 = 14/15+ 8/15 = 26/15
A=\(\dfrac{3}{1}\).(\(\dfrac{3}{2.5}\)+\(\dfrac{3}{5.8}\)+...+\(\dfrac{3}{98.101}\))
A=3.(\(\dfrac{1}{2}\)-\(\dfrac{1}{5}\)+\(\dfrac{1}{5}\)-\(\dfrac{1}{8}\)+...+\(\dfrac{1}{98}\)-\(\dfrac{1}{101}\))
A=3.(\(\dfrac{1}{2}\)-\(\dfrac{1}{101}\))
A=3.\(\dfrac{98}{202}\)
A=\(\dfrac{294}{202}\)=\(\dfrac{147}{101}\)
B; 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
= 36 x (28+82) + 64 x (69 + 41)
= 36 x 110 + 64 x 110
= (36+64) x 110
= 100 x 110
= 11000
b) 36 nhan ( 28+82) + 64 nhan ( 69 + 41)
= 36. 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 .100
=11000
\(P\left(x\right)+Q\left(x\right)=\left(2x^4+x^3-4x+5\right)+\left(x^4+3x^3+2x-1\right)\)
\(=2x^4+x^3-4x+5+x^4+3x^3+2x-1\)
\(=\left(2x^4+x^4\right)+\left(x^3+3x^3\right)+\left(-4x+2x\right)+\left(5-1\right)\)
\(=3x^4+4x^3-2x+4\)
\(R\left(x\right)+P\left(x\right)=x^4-2x^2+1\)
\(\Rightarrow R\left(x\right)=\left(x^4-2x^2+1\right)-P\left(x\right)\)
\(\Rightarrow R\left(x\right)=\left(x^4-2x^2+1\right)-\left(2x^4+x^3-4x+5\right)\)
\(\Rightarrow R\left(x\right)=x^4-2x^2+1-2x^4-x^3+4x-5\)
\(\Rightarrow R\left(x\right)=\left(x^4-2x^4\right)+\left(-2x^2\right)+\left(1-5\right)+\left(-x^3\right)+4x\)
\(\Rightarrow R\left(x\right)=-x^4-2x^2-4-x^3+4x\)
3 + 3 + 2 + 5 + 1
= 6 + 2 + 5 + 1
= 8 + 5 + 1
= 13 + 1
= 14
3 + 3 + 2 + 5 + 1
= ( 3 + 2 ) + 3 + 5 + 1
= 5 + 3 + 5 + 1
= 5 + 5 + 3 + 1
= 5 x 2 + 3 + 1
= ( 5 x 2 ) + 3 + 1
= 10 + 3 + 1
= 13 + 1
= 14
3 + 3 + 2 + 5 + 1
= 6 + 2 + 5 + 1
= 8 + 5 + 1
= 13 + 1
= 14
3 + 3 + 2 + 5 + 1
= ( 3 + 2 ) + 3 + 5 + 1
= 5 + 3 + 5 + 1
= 5 + 5 + 3 + 1
= 5 x 2 + 3 + 1
= ( 5 x 2 ) + 3 + 1
= 10 + 3 + 1
= 13 + 1
= 14
3 + 3 + 2 + 5 + 1
= 6 + 2 + 5 + 1
= 8 + 5 + 1
= 13 + 1
= 14
3 + 3 + 2 + 5 + 1
= ( 3 + 2 ) + 3 + 5 + 1
= 5 + 3 + 5 + 1
= 5 + 5 + 3 + 1
= 5 x 2 + 3 + 1
= ( 5 x 2 ) + 3 + 1
= 10 + 3 + 1
= 13 + 1
= 14
14 k mik nha