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\(25+3.\left(x-8\right)=106\)
\(3.\left(x-8\right)=106-25\)
\(3.\left(x-8\right)=81\)
\(x-8=27\)
\(x=27+8\)
\(x=35\)
25+3x(X-8)=106
=>3x(X-8)=106-25
=>3x(X-8)=81
=>X-8=81:3
=>X-8=27
=>X=27+8
=>X=35
nhớ
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\(2x+\dfrac{7}{99}.\dfrac{8}{15}=\dfrac{106}{99}.\dfrac{8}{15}\)
=> \(2x+\dfrac{8}{15}.\dfrac{7}{99}-\dfrac{8}{15}.\dfrac{106}{99}=0\)
=> \(2x+\dfrac{8}{15}\left(\dfrac{7}{99}-\dfrac{106}{99}\right)=0\)
=> \(2x+\dfrac{8}{15}.\left(-1\right)=0\)
=> \(2x-\dfrac{8}{15}=0\)
=> \(2x=\dfrac{8}{15}\)
=> \(x=\dfrac{8}{15}:2=\dfrac{4}{15}\)
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\(2\times3\times5+25\times8\times4+70+4\times2\times25\)
\(=15\times2+100\times8+70+100\times2\)
\(=30+800+70+200\)
\(=\left(30+70\right)+\left(800+200\right)\)
\(=100+100\times10\)
\(=100+1000\)
\(=1100\)
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\(...=25x4x\left(7x3+3x4x5+2\right)=100x\left(21+120+2\right)=100x143=14300\)
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7 x 12 x25 +3 x 16 x125 +8 x25
=7 x4 x3 x25 +3 x4 x4 x5 x25+4x2x25
=(4 x25) x(7 x3 +3 x4 x5 +2)
= 100 x (21 +60 +2)
= 100 x 83
= 8300
25 + 3 ( x - 8 ) = 106
3 ( x - 8 ) = 81
x - 8 = 27
x = 35
\(25+3\left(x-8\right)=106\)
\(3\left(x-8\right)=106-25\)
\(3\left(x-8\right)=81\)
\(x-8=81:3\)
\(x-8=27\)
\(x=27+8\)
\(x=35\)