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\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)
3, 54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x 73 + 3,54 x 27 + 0,23 x 25 + 0,17 x 25
= 3,54 x(73+27) + 25 x (0,23+0,17)
= 3,54 x 100 + 25 x 0,4
= 3,54 x 100 + 10
= 35,4 x 10 + 10
= 10 x (35,4+1)
= 10 x 36,4
= 364
21 x 23 x 25 x 27 - 11 x 13 x 15 x 17
=(21-11)x(23-13)x(25-15)x(27-17)
=10x10x10x10
=10000
\(\text{21 x 23 x 25 x 27 - 11 x 13 x 15 x 17}\)
\(=\)\(483.675-143.\)\(255\)
\(=\)\(326025\)\(-\)\(36465\)
\(=\)\(289560\)
Tính nhanh :
25 x 27 x 2x 4 x 5
= ( 25 x 4 ) x ( 5 x 2 ) x 27
= 100 x 10 x 27
= 27 000
22 x X + X x 27 + X = 25
22 x X + X x 27 + X x 1 = 25
X x ( 22 + 27 +1 ) = 25
X x 50 = 25
X = 25 : 50
X = \(\dfrac{1}{2}\) = 0,5
22 x X + X x 27 + X = 25
22 x X + X x 27 + X x 1 = 25
X x (22 + 27 + 1) = 25
X x 50 = 25
X = 25 : 50
X = 0,2
Chúc bạn học tốt!
`@` `\text {Ans}`
`\downarrow`
`22 \times x + 27 \times x + x = 25`
`x \times (22 + 27 + 1) = 25`
`x \times 50 = 25`
`x = 25 \div 50`
`x =`\(\dfrac{25}{50}=\dfrac{1}{2}\)
Vậy, \(x=\dfrac{1}{2}\)
\(22xX+27xX+X=25\\ \left(22+27+1\right)xX=25\\ 50xX=25\\ x=50:25=2.\)
Vậy \(X=2.\)
53 x 4 x 3 x 25 = 53 x ( 4 x 25 ) x 3
= 53 x 100 x 3
= 15900
327 x 73 + 27 x 327 = 327 x ( 73 + 27 )
= 327 x 100
= 32700
Hok Tốt nhen
a) \(52\times4\times3\times25\)
\(=\left(52\times3\right)\times\left(4\times25\right)\)
\(=156\times100\)
\(=15600\)
b) \(327\times73+27\times327\)
\(=327\left(73+27\right)\)
\(=327\times100\)
\(=32700\)
\(22\times x+27\times x+x=25\)
\(x\times\left(22+27+1\right)=25\)
\(50x=25\)
\(x=\dfrac{25}{50}=\dfrac{1}{2}\)
\(x\)x50=25
\(x\) =25:50
\(x\) =0,5