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91 x 157 - 29 x 91 - 91 x 28
=9100
127 x 63 + 19 x 127 - 82 x 26
=8282
2 x 9 x 41 + 36 + 3 x 57 x 6
=1800
29 x 17 + 31 x 29 + 48 x 93 - 48 x 22
=4800
1125 - 25 x 30 + 0,06 : 0,2
=375.3
Bn k cho mk nha!
91 x 157 - 29 x 91 - 91 x 28
= 19 (157 - 29 - 28)
=19 * 100
=1900
127 x 63 + 19 x 127 - 82 x 26
= 127 (63 + 19) - 82 * 26
= 127 * 82 - 82 * 26
= 82 (127 - 26)
= 82 * 101
= 8282
2 x 9 x 41 + 36 + 3 x 57 x 6
= 738 + 36 + 1026
= 1800
29 x 17 + 31 x 29 + 48 x 93 - 48 x 22
= 29 (17 + 31) + 48 (93 - 22)
= 29 * 48 + 48 * 71
= 48 (29 + 71)
= 48 * 100
= 4800
1125 - 25 x 30 + 0,06 : 0,2
= 1125 - 750 + 0,3
= 375 + 0,3
= 375,3
a) x - 57 = 63
x = 63 + 57
x = 120
b)119 - x = 97
x = 119 -97
x = 22
c) 7.x : 28 = 5
7.x = 28x5
7.x = 140
x= 140 : 7
x= 20
d) 1751: x = 103
x = 1751 : 103
x = 17
a: =>-2x+17=9
=>-2x=-8
hay x=4
b: =>15-x=-10
hay x=25
c: =>7x=-4
hay x=-4/7
d: =>\(9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
g: \(\Leftrightarrow2x-4+5⋮x-2\)
\(\Leftrightarrow x-2\in\left\{1;-1;5;-5\right\}\)
hay \(x\in\left\{3;1;7;-3\right\}\)
a: =>-2x=9-17=-8
hay x=4
b: =>15-x=-10
hay x=25
d: \(\Leftrightarrow9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
e: \(\Leftrightarrow\left[{}\begin{matrix}2x-4=0\\3-x=0\end{matrix}\right.\Leftrightarrow x\in\left\{2;3\right\}\)
b: =>15-x=-10
hay x=25
a: =>-2x+17=9
=>-2x=-8
hay x=4
d: \(\Leftrightarrow9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
e: \(\Leftrightarrow\left[{}\begin{matrix}2x-4=0\\3-x=0\end{matrix}\right.\Leftrightarrow x\in\left\{2;3\right\}\)
a)
2 9 − 7 8 . x = 1 3 7 8 . x = 2 9 − 1 3 7 8 . x = − 1 3 x = − 1 3 : 7 8 x = − 8 21
b)
4 5 + 5 7 : x = 1 6 5 7 : x = 1 6 − 4 5 5 7 : x = − 19 30 x = 5 7 : − 19 30 x = − 150 133
a ) x = − 91 60 . b ) x = − 8 9 . c ) x = 35 19 . d ) x = 3 7 .
a) 216 +(102-x) = 347
216 + 102 - x = 347
318 - x = 347
x = -29
b) 127 - (x+29) = 93
127 - x - 29 = 93
127 - 29 - x = 93
98 - x = 93
x = 5
c) ( x - 57) - 119 = 0
x - 57 - 119 = 0
x - (57+119) = 0
x - 176 = 0
x = 176
a, 216+(102-x)=347
102-x=347-216
102-x=131
x=102-131
x=-29
Vậy x=-29
b, 127-(x+29)=93
x+29=127-93
x+29=34
x=34-29
x=5
Vậy x=5
c, (x-57)-119=0
x-57=0+119
x-57=119
x=119+57
x=176
Vậy x=176