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Bài giải
a, \(-\left(-x\right)-\left(-9\right)=-\left(3-6-9+3\right)\)
\(x+9=-3+6+9-3\)
\(x+9=15\)
\(x=15-9\)
\(x=6\)
b, \(17-x=7-6x\)
\(6x-x=7-17\)
\(5x=-10\)
\(x=-10\text{ : }5\)
\(x=-2\)
c, \(5x-7=-21-2x\)
\(5x+2x=-21+7\)
\(7x=-14\)
\(x=-14\text{ : }7\)
\(x=-2\)
d, \(7\left(x-3\right)-5\left(3-x\right)=11x-5\)
\(7x-21-15+5x=11x-5\)
\(7x+5x-11x=21+15-5\)
\(x=31\)
a) \(\dfrac{7}{5}x\div\left(9-6\dfrac{13}{21}\right)=2\dfrac{13}{25}\)
\(\dfrac{7}{5}x\div\left(9-\dfrac{139}{21}\right)=\dfrac{63}{25}\)
\(\dfrac{7}{5}x\div\dfrac{50}{21}=\dfrac{63}{25}\)
\(\dfrac{7}{5}x=6\)
\(x=\dfrac{30}{7}\)
b) \(\left(1,16-x\right)\times5,25\div\left(10\dfrac{5}{9}-7\dfrac{1}{4}\right)\times2\dfrac{2}{17}=75\%\)
\(\left(1,16-x\right)\times5,25\div\left(\dfrac{95}{9}-\dfrac{29}{4}\right)\times\dfrac{36}{17}=\dfrac{75}{100}\)
\(\left(1,16-x\right)\times5,25\div\dfrac{119}{36}=\dfrac{17}{48}\)
\(\left(1,16-x\right)\times5,25=\dfrac{2023}{1728}\)
\(1,16-x=\dfrac{289}{1296}\)
\(x=0,9370061728\)
52 .(y : 78) = 3380
y : 78 = 3380 : 52
y : 78 = 65
y = 65 . 78
y = 5070
\(x\inƯ\left(63\right)\)
\(Ư\left(63\right)=\left\{1;3;7;9;21;63\right\}\)
\(x+1\inƯ\left(63\right)\Rightarrow x=1-1=0\)
\(x=3-2=1\)
\(x=7-1=6\)
\(x=9-8=1\)
\(x=21-1=20\)
\(x=63-1=62\)
\(\Rightarrow x\in\left\{0;2;6;8;20;62\right\}\)
a) \(\left(9^4.8+9^4.5\right):\left(9^2.\left(10-1\right)\right)\)
=\(9^4.13:9^3=13.9=117\)
b) 100-(75-25)=100-50=50
Tính phải k nhỉ?
`1)`
`2x + 3x + 5x`
`= (2 + 3 + 5)x`
`= 10x`
`2)`
`2.x - x + 3.x`
`= (2 - 1 + 3)x`
`= 4x`
`3)`
`9.x - 3 - 3.x`
`= (9 - 3)x - 3`
`= 6x - 3`
`4)`
Thiếu dấu, bạn bổ sung thêm
`5)`
`x - 0,2x - 0,1x`
`= (1 - 0,2 - 0,1)x`
`=0,7x`
`6)`
\(\dfrac{7}{2}x-\dfrac{1}{2}x=\left(\dfrac{7}{2}-\dfrac{1}{2}\right)x=3x\)
đề thiếu