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Bài 1:
a: x/-2=-18/x
=>x2=36
=>x=6 hoặc x=-6
b: x/2+x/5=17/10
=>7/10x=17/10
hay x=17/7
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a) \(\left(x-\frac{2}{3}\right)^2=\frac{25}{36}\)
\(\Rightarrow x-\frac{2}{3}=\pm\frac{5}{6}\)
Nếu \(x-\frac{2}{3}=\frac{5}{6}\Rightarrow x=\frac{5}{6}+\frac{2}{3}=\frac{3}{2}\)
Nếu \(x-\frac{2}{3}=\frac{-5}{6}\Rightarrow x=\frac{-5}{6}+\frac{2}{3}=\frac{-1}{6}\)
Vậy \(x=\left\{-\frac{1}{6};\frac{3}{2}\right\}\)
b) \(\left(\frac{3}{4}-x\right)^3=-8\)
Mà \(\left(-2\right)^2=-8\)
\(\Rightarrow\frac{3}{4}-x=-2\Rightarrow x=\frac{3}{4}-\left(-2\right)=\frac{3}{4}+2=\frac{11}{4}\)
Vậy \(x=\left\{\frac{11}{4}\right\}\)
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1. a) 4.415.8.25.125
= (4.25). (8.125).415
= 100.1000.415
= 100000.415
= 41500000
b) 2.31.12+4.42.6+8.27.3
= (2.31.12)+(4.42.6)+(8.27.3)
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24 (31+42+27)
= 24.100
= 2400
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1) 62 . x = 36
=> x = 36 / 36 = 1
2) 9x - 42 = 11
9x - 16 = 11
9x = 11 + 16 =27
=> x = 27/9=3
3) 10 + 2x = 42
2x = 16 - 10 =6
=> x = 3
4) 231 - ( x - 6 ) =103
( x - 6 ) = 231-103=128
=> x = 128+6=134
5) 10 + 3x = 45 / 42
3x = 43-10=64-10=54
x = 18
6)25 + 52x = 82 + 62
25 + 25x = 100
25x = 100-25=75
=> x = 75/25=3
*Chúc bạn học tốt*
1) 62.x=36 2) 9.x-42=11 3)10+2.x=42 4)231-(x-6)=103 5)10+3x=45:42 6)25+52.x=82+62
36.x=36 9.x-16=11 10+2.x=16 x-6 = 231-103 10+3x=43 25+25.x =64+36
x=36:36 9.x =11+16 2.x =16-10 x-6 =128 10+3x=64 25+25.x =100
x=1 9.x =27 2.x =6 x =128+6 3x=64-10 25.x =100-25
x =27:9 x =6:2 x =134 3x=54 25.x =75
x =3 x =3 x=54:3 x =75:25
x=18 x =3
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Bạn viết khó hiểu quá!! Bạn viết lại đề bài rõ ràng để mình giải giùm cho.
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a.67+( -2018)+33+2018-189
=[(-2018)+2018]+(67+33)-189
=0+100-189
=100-189
= -89