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66.74+34.66+66.36+34.64
=66.74+66. 36+34.66+34.64
=66.(74+36)+34.(66+64)
=66.110+34.130
=7260+4420
=11680
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(34\times76+66\times110+34\times34\)
\(=34\times\left(76+34\right)+66\times110\)
\(=34\times110+66\times110=110\times\left(34+66\right)=110\times100=110000\)
34 x 76 + 66 x 110 + 34 x 34
= 34 x ( 76 + 34 ) + 66 x 110
= 34 x 110 + 66 x 110
= 110 x ( 34 + 66 )
= 110 x 100
= 11 000
=))
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Ta có 34.(66 - 5) - 66.(34 + 5)
= 34.66 - 34.5 - 66.34 - 66.5
= -5.(34 + 66)
= - 5.100 = - 500
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34(66-5)-66(34+5)=34.66-34.5-34.66-66.5=(34.66-34.66)-5(34+66)=-500
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34.66 - 34.4 - 66.34 - 66.4
= ( 34.66 - 66.34) - ( 34.4 +66.4)
= 0 - 4.(34+66)
= -4.100
= -400
\(34.\left(66-4\right)-66.\left(34+4\right)\\ =34.66-34.4-66.34-66.4\\ =\left(34-34-4\right).66-34.4\\ =-4.66-34.4\\ =4.\left(-66\right)-34.4\\ =4.\left(-66-34\right)\\ =4.\left(-100\right)\\=-400\\ -264.\left(-400\right).264.40\\ =264.400.264.40\\ =264.4.100.264.4.10\\ =264.4.264.4.\left(100.10\right)\\ =\left(264.4\right)^2.1000\\ =1115136.1000=1115136000\)
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`34+2(x-5)^2=66`
`=>2(x-5)^2=66-34`
`=>2(x-5)^2=32`
`=>(x-5)^2=32:2`
`=>(x-5)^2=16=(4)^2=(-4)^2`
`=>` $\left[ \begin{array}{l}x-5=4\\x-5=-4\end{array} \right.$
`=>` $\left[ \begin{array}{l}x=9\\x=1\end{array} \right.$
Vậy x=9 hoặc x=1
Ta có: \(34+2\left(x-5\right)^2=66\)
\(\Leftrightarrow2\left(x-5\right)^2=32\)
\(\Leftrightarrow\left(x-5\right)^2=16\)
\(\Leftrightarrow\left[{}\begin{matrix}x-5=4\\x-5=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=9\\x=1\end{matrix}\right.\)
Vậy: \(x\in\left\{1;9\right\}\)
66 x 74 + 34 x 66 + 66 36 + 34 x64
= 66 x ( 74 + 34 +36 +64 )
= 66 x 208
= 13728
học tốt
66.74+34.66+66.36+34.64
=66 (74+34+36+34)
=13728