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Bài giải
a, \(1075\cdot\left(x-3\right)\cdot\left(x-1\right)=0\)
\(\left(x-3\right)\left(x-1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x-1=0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=3\\x=1\end{cases}}\)
\(\Rightarrow\text{ }x\in\left\{3\text{ ; }1\right\}\)
b, \(2\cdot\left(x-7\right)+3\cdot\left(x+1\right)\)
\(=2x-14+3x+3\)
\(=5x-11\)
c, \(x+1+x+2+...+x+100=5750\)
\(\left(x+x+...+x\right)+\left(1+2+...+100\right)=5750\)
\(100x+\left(100-1+1\right)\cdot\left(100+1\right)\text{ : }2=5750\)
\(100x+100\cdot101\text{ : }5=5750\)
\(100x+50\cdot101=5750\)
\(100x+5050=5750\)
\(100x=5750-5050\)
\(100x=700\)
\(x=700\text{ : }100\)
\(x=7\)
39x[250+87]+64x[240+97]
=39x337+64x337
=(39+64)x337
=103x337
=34711
78x31+78x24+78x17-22x72
=78x(31+24+17)-22x72
=78x72-22x72
=(78-22)x72
=56x72
=4032
bn tính lại nha
39 x [ 250 + 87 ] + 64 x [ 240 + 97 ]
= 39 x 337 + 64 x 337
= 337 x ( 39 + 64 )
= 337 x 103
= 34711
bai tiep
78 x 31 + 78 x 24 +78 x 17 - 22
= 78 x ( 31 + 24 + 17 ) - 22 x 72
= 78 x 72 - 22 x 72
=72 x ( 72 - 22 )
= 72 x 50
= 3600
75%x + x = 1,5
=> 3/4x + x = 1,5
=> 7/4x = 1,5
=> x = 1,5 : 7/4
=> x = 6/7
\(1,5\times3,2\times x-0,6=2,25\) \(\Leftrightarrow1,5\times3,2\times x=2,25+0,6\) \(\Leftrightarrow1,5\times3,2\times x=2,85\) \(\Leftrightarrow3,2\times x=2,85:1,5\) \(\Leftrightarrow3,2\times x=1,9\) \(\Leftrightarrow x=1,9:3,2\) \(\Leftrightarrow x=0,59375\)
\(-\dfrac{2}{3}=\dfrac{x}{-6}\Rightarrow x=\left(-\dfrac{2}{3}\right)\left(-6\right)=4\)
\(-\dfrac{2}{3}=\dfrac{10}{-y}\Rightarrow y=\left(-10\right):\left(-\dfrac{2}{3}\right)=15\)
\(-\dfrac{2}{3}=\dfrac{z}{9}\Rightarrow z=\left(-\dfrac{2}{3}\right).9=-6\)
\(\dfrac{-2}{3}=\dfrac{x}{-6}=\dfrac{10}{-y}=\dfrac{z}{9}\)
\(x=\left(-6.-2\right):3=4;y=\left(-6.10\right):-4=15;z=\left(10.9\right):-15=-6\)
1. => 3x+6 = -6 hoặc 3x+6 = 6
=> x = -4 hoặc x=0
2. => (4-2x)^2 = 7+9 = 16
=> 4-2x=-4 hoặc 4-2x = 4
=> x=4 hoặc x=0
3. => 3x-5 = -4
=> x = 1/3
Tk mk nha
1) \(\left(3x+6\right)^2=36\)
\(\left(3x+6\right)^2=\orbr{\begin{cases}\left(-6\right)^2\\6^2\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}3x+6=-6\\3x+6=6\end{cases}}\Rightarrow\orbr{\begin{cases}3x=-12\\3x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-4\\x=0\end{cases}}\)
những câu sau tương tự
a,\(2,5.16,27.4+7,3=16,27.10+7,3=162,7+7,3=170\)
b,\(8.6.10+4.25.12+3.16.31+2.34.24=48.10+48.25+48.31+48.34\)
\(=48.\left(10+25+31+34\right)=48.100=4800\)
c,\(78.31+78.24+78.17+22.72=78\left(31+24+17\right)+22.72=78.72+22.72\)
\(=72.\left(78+22\right)=72.100=7200\)
d,\(102.67-34.51=102.67-17.102=102.\left(67-17\right)=102.50=5100\)
đéo hiểu thì cút nhé đéo ai khiến m trả lời cả . ngu thì nói ngu đi đừng bày đặt t ghét nhất là cái loại như m đấy ạ
Bài 2
a, \(1-\left(12,5+x-4,25\right):21,75=0\)
\(=>21,75-12,5-x+4,25=0\)
\(=>13,5-x=0=>x=13,5\)
b,\(x.101-x+72.99+72=21050\)
\(=>100x+72.100=21050\)
\(=>100\left(x+72\right)=21050\)
\(=>x+72=210,5\)\(=>x=138,5\)
c,\(151-2\left(x-6\right)=2227:17\)
\(=>151-2\left(x-6\right)=131\)
\(=>2\left(x-6\right)=20\)
\(=>2x=32=>x=16\)
d,\(\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+...+\left(x+26\right)=210\)\(=>12x+\left(4+6+8+...+26\right)=210\)
\(=>12x+180=210=>12x=30\)
\(=>x=\frac{30}{12}=\frac{15}{6}=\frac{5}{2}\)
