1 + 1 =
45 + 20 =
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\(45\times1+45\times2+45\times3+45\times4+45\times5+45\times15+45\times20+45\times50\)
\(=45\times\left(1+2+3+4+5+15+20+50\right)\)
\(=45\times100\)
\(=4500\)
kết quả bằng : 4500 chac chan minh tinh bang may tinh ma
chúc bạn học giỏi
P = \(1\)- (\(3\sqrt{5}\) -\(2\)\(\sqrt{5}\) -\(\sqrt{3}\) )(\(2\sqrt{5}-3\sqrt{5}-\sqrt{3}\))
= 1- (\(\sqrt{5}-\sqrt{3}\) )(\(-\sqrt{5}-\sqrt{3}\) )
= 1+ ( \(\sqrt{5}-\sqrt{3}\) )( \(\sqrt{5}+\sqrt{3}\) )
= 1+ (5-3)
= 3
\(1-\left(\sqrt{45}-\sqrt{20}-\sqrt{3}\right)\left(\sqrt{20}-\sqrt{45}-\sqrt{3}\right)\)
\(=1-\left(\sqrt{45}-\sqrt{20}-\sqrt{3}\right)\left(\sqrt{20}-\sqrt{45}-\sqrt{3}\right)\)
\(=1-\left(3\sqrt{5}-2\sqrt{5}-\sqrt{3}\right)\left(2\sqrt{5}-3\sqrt{5}-\sqrt{3}\right)\)
\(=1-\left(\sqrt{5}-\sqrt{3}\right)\left(-\sqrt{5}-\sqrt{3}\right)\)
= 1 + 3
= 2
\(1-\left(\sqrt{45}-\sqrt{20}-\sqrt{3}\right)\cdot\left(\sqrt{20}-\sqrt{45}-\sqrt{30}\right)\)
= \(1-\left(\sqrt{3}+\left(\sqrt{20}-\sqrt{45}\right)\right)\cdot\left(\sqrt{3}-\left(\sqrt{20}-\sqrt{45}\right)\right)\)
=\(1-\left(\sqrt{3}^2-\left(\sqrt{20}-\sqrt{45}\right)^2\right)\)
=\(1-\left(3-\left(20-2\cdot\sqrt{20}\cdot\sqrt{45}+45\right)\right)\)
=\(1-\left(3-\left(65-2\cdot\sqrt{900}\right)\right)\)
=\(1-\left(3-\left(65-2.30\right)\right)\)
=\(1-\left(3-5\right)\)
=3
a, 25+35+76+65+22
=(65+35)+(76+22)+25
=100+100+25
=225
c , 78-23-25
=78-(23+25)
=78-48
=30
a , x-45=20
x=20+45
x=65
b , 45 - x=20
x =45-20
x= 25
\(B=\dfrac{1}{2}+\dfrac{3}{10}+\dfrac{4}{45}+\dfrac{11}{180}+\dfrac{1}{20}\)
\(B=\dfrac{90}{180}+\dfrac{54}{180}+\dfrac{16}{45}+\dfrac{11}{180}+\dfrac{9}{180}\)
\(B=\dfrac{90+54+16+11+9}{180}\)
\(B=\dfrac{180}{180}\)
\(B=1\)
1 + 1 = 2
42 + 20 = 62
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