22 x 91 = ?
94 x 30 =?
56 x 19 = ?
giúp mình với
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a) 19 + (x - 23) = 50
x - 23 = 50 - 19
x - 23 = 31
=> x = 31 + 23
x = 54
b) (273 - x) - 140 = 34
(273 - x) = 34 + 140
(273 - x) = 174
x = 273 - 174
x = 99
c) 56 - (x - 14) = 22
x - 14 = 56 - 22
x - 14 = 34
x = 34 + 14
x = 48
d) 172 - (137 - x) = 93
137 - x = 172 - 93
137 - x = 79
x = 137 - 79
x = 58
e) 13. (x - 14) = 91
x - 14 = 91 : 13
x - 14 = 7
x = 14 + 7
x = 21
g) (13 - x).17 = 51
13 - x = 51 : 17
13 - x = 3
x = 13 - 3
x = 10
chúc bn học giỏi ^^ !
ok mk nha!! ! 5654645645767676576558578779769675634636457567687689978978978978766876765657886567567
1.19+(x-23)=50
<=>x-23=50-19
<=>x-23=31
<=>x=31+23
<=.x=54
vậy x=54
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
\(a,\Rightarrow x+2=-40\\ \Rightarrow x=-42\\ b,\Rightarrow6x-7-2x=5\\ \Rightarrow4x=12\Rightarrow x=3\\ c,\Rightarrow68-56-x=-2\\ \Rightarrow12-x=-2\\ \Rightarrow x=14\)
\(a.13.\left(78+22\right)=13.100=1300\)
\(b.25.70+28.25+25.2=25.\left(70+28+2\right)=25.100=2500\)
\(c.\dfrac{15.3.14.2.19}{19.14.15}=6\)
\(d.\dfrac{132.70.60}{12.35.20}=\dfrac{11.12.35.2.20.3}{12.35.20}=66\)
\(\frac{15x38}{19x5}\)<x<\(\frac{67+56}{15}\)
\(\frac{570}{95}\)<x<\(\frac{123}{15}\)
6<x<8,2
Suy ra x=6,1;6,2;6,3;6,4;6,5;6,6;6,7......đến 8,1
Chúc học tốt
Trên đây chỉ là cách nghĩ của mình thui nha. Sai mong mn thồng cảm
1) 42/35 - [ 33/14 . 21/22 - ( 54/25 : 27/25 - 7/10 )]
= 42/35 - ( 9/4-13/10)
=42/35-19/20
=1/4
2) a) 5/21 . x/34 = 35/102
x/34=35/102 : 5/21
x/34=49/34
=> x=34
Vậy x=34
b) 15/x . 21/13 = 45/91
15/x=45/91 : 21/13
15/x=15/49
=> x=49
Vậy x=49
\(\dfrac{19.2.22.9.2.3}{19.3.22.9.5}=\dfrac{4}{5}\)
Bài 4:
a: xy=-2
=>\(x\cdot y=1\cdot\left(-2\right)=\left(-2\right)\cdot1=\left(-1\right)\cdot2=2\cdot\left(-1\right)\)
=>\(\left(x,y\right)\in\left\{\left(1;-2\right);\left(-2;1\right);\left(-1;2\right);\left(2;-1\right)\right\}\)
b: \(\left(x-1\right)\left(y+2\right)=-3\)
=>\(\left(x-1\right)\cdot\left(y+2\right)=1\cdot\left(-3\right)=\left(-3\right)\cdot1=-1\cdot3=3\cdot\left(-1\right)\)
=>\(\left(x-1;y+2\right)\in\left\{\left(1;-3\right);\left(-3;1\right);\left(-1;3\right);\left(3;-1\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(2;-5\right);\left(-2;-1\right);\left(0;1\right);\left(4;-3\right)\right\}\)
Bài 3:
a: \(x\left(x+9\right)=0\)
=>\(\left[{}\begin{matrix}x=0\\x+9=0\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=0\\x=-9\end{matrix}\right.\)
b: \(\left(x-5\right)^2=9\)
=>\(\left[{}\begin{matrix}x-5=3\\x-5=-3\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=3+5=8\\x=-3+5=2\end{matrix}\right.\)
c: \(\left(7-x\right)^2=-64\)
mà \(\left(7-x\right)^2>=0\forall x\)
nên \(x\in\varnothing\)
Bài 2:
a: \(\left(-31\right)\cdot x=-93\)
=>\(31\cdot x=93\)
=>\(x=\dfrac{93}{31}=3\)
b: \(\left(-4\right)\cdot x=-20\)
=>\(4\cdot x=20\)
=>\(x=\dfrac{20}{4}=5\)
c: \(5x+1=-4\)
=>\(5x=-4-1=-5\)
=>\(x=-\dfrac{5}{5}=-1\)
d: \(-12x+1=-4\)
=>\(-12x=-4-1=-5\)
=>\(12x=5\)
=>\(x=\dfrac{5}{12}\)
22*91=2002 94*30=2820 56*19=1064
22 x 91 = 2002
94 x 30 = 2820
56 x 19 = 1064
k mình nha