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a) (-x+31) -39= -69+11
(-x+31) -39= -58
-x+31=-58+39
-x+31=-19
-x=-19-31
-x=-50
x=50
b)-129-(35-x) =55
35-x=-129-55
35-x=-184
x=35-(-184)
x=219
c) (-37)-l 7-yl =-127
l 7-yl =(-37)-(-127)
l 7-yl =90
=>7-y=90 hoặc 7-y=-90
y=7-90 y=7-(-90)
y=-83 y=97
d) (2y-5)2 =9
(2y-5)2 =32
=>2y-5=3
2y=3+5
2y=8
y=8:2
y=4
e)(1-3x)3= -8
(1-3x)3= (-2)3
1-3x=-2
3x=1-(-2)
3x=3
x=3:3
x=1
**** nhé
37+| 7-x | =127
|7-x | = 90
7-x=90 hoặc 7-x=-90
x=-81 hoắc x=97
a. - (- 94) + (67 - x) : 2 = (- 34 - 14)
b. 73 - (- 20 + 37) = x - (57 - 39)
c. - (- 34 - 23) = x + 37
\(a,-\left(-94\right)+\left(67-x\right):2=\left(-34-14\right)\)
\(94+67-x:2=-48\)
\(161-x:2=-48\)
\(x:2=209\)
\(x=\frac{209}{2}\)
\(\left(-x+31\right)-39=69+11\Leftrightarrow-x+31-39=80\)
\(\Leftrightarrow\) \(-x=80+39-31=88\) \(\Leftrightarrow\) \(x=-88\) vậy \(x=-88\)
\(\left(-x+31\right)-39=69+11\)
\(\Leftrightarrow\left(-x+31\right)-39=80\)
\(\Leftrightarrow-x+31=80+39\)
\(\Leftrightarrow-x+31=119\)
\(\Leftrightarrow-x=119-31\)
\(\Leftrightarrow-x=88\Rightarrow x=-88\)
\(\Leftrightarrow\) \(-x=-58+39-31=-50\) \(\Leftrightarrow\) \(x=50\) vậy \(x=50\)
Tập ghi có dấu đi bạn ei
ghi như thế méo ai hiểu đâu
và......kết bạn nha!
>< :3 :))
a,12345679x45=12345679x9x5=111111111x5=555555555
b,43 x 37+93 x 43+57 x 61+69 x 57
=43x(37+93)+57(61+69)
=43 x 130+57 x 130
=130 x(43+57)
=130 x 100
=13000
1. a) (a - b) - (b + c) + (c - a) - (a - b - c) = -(a + b + c)
Ta có VT = (a - b) - (b + c) + (c - a) - (a - b - c)
= a - b - b - c + c - a - a + b + c
= -a - b - c
= -(a + b + c) = VP
b) P = a * (b - a) - b * (a - c) - bc
P = ab - a^2 - ab + bc - bc
P = -a^2
a) \(39\times118+29\times82\)
\(=39\times2\times59+29\times2\times41\)
\(=2\times\left(39\times59+29\times41\right)\)
\(=2\times\left(2301+1189\right)\)
\(=2\times3490\)
\(=6980\)
b) \(37\times39+78\times14-13\times85-52\times55\)
\(=37\times3\times13+6\times13\times14+13\times85-4\times13\times55\)
\(=13\times\left(37\times3+6\times14+85-4\times55\right)\)
\(=13\times\left(111+84+85-220\right)\)
\(=13\times\left(280-220\right)\)
\(=13\times60\)
\(=780\)
c) \(368:16+752:16+480:16\)
\(=\left(368+752+480\right):16\)
\(=\left(1120+480\right):16\)
\(=1600:16\)
\(=100\)
d) \(5\times11\times18+9\times31\times10+4\times29\times45\)
\(=5\times11\times9\times2+9\times31\times10+2\times2\times29\times5\times9\)
\(=10\times9\times11+10\times9\times31+10\times29\times2\times9\)
\(=90\times11+90\times31+90\times29\times2\)
\(=90\times\left(11+31+29\times2\right)\)
\(=90\times\left(42+58\right)\)
\(=90\times100\)
\(=9000\)
b: \(\Leftrightarrow-37+57+x=20\)
hay x=0