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a ) x − 28 : − 12 = − 5 x − 28 = − 5 . − 12 x − 28 = 6 0 x = 6 0 + 28 x = 88
b ) x + 15 : − 28 = 8 x + 15 = 8 . − 28 x + 15 = − 224 x = − 224 – 15 x = − 239
c ) x + 3 0 : − 45 = − 4 x + 3 0 = − 4 . − 45 x + 3 0 = 18 0 x = 18 0 – 3 0 x = 15 0
a/ -x + 8 = -17-30
-x + 8 = -47
-x = -47 - 8
-x = -55
x = 55
Vậy x = 55
b/ 35 – x = 37
x = 35 - 37
x = -2
Vậy x = -2
c/ (-19 – x) + 23 = -20
-19 – x = -20 - 23
-19 – x = -43
x = -19 - (-43)
x = 24
Vậy x = 24
d/ (x – 45) : 2 = -17
x – 45 = -17 * 2
x – 45 = -34
x = -34 + 45
x = 11
Vậy x = 11
a/ -x + 8 = -17-30
-x + 8 = -47
-x =-47 - 8
-x = -55
x = 55
Vậy x = 55
Phần a mình bị lỗi nên sửa lại nha
a) -x +8=-17-30
-x+8+17+30=0
-x+55=0
-x=-55
x=55
b) 35-x=37
x=-2
c)(-19-x)+23=-20
-19-x+23+20=0
24-x=0
x=24
d) ( x-45):2=-17
x-45=-34
x=11
a) -x + 8 = -17 - 30
-x + 8 = -47
-x = -47 - 8
-x = -55
=> x = 55
Vậy x = 55
b) 35 - x = 37
x = 35 - 37
x = -2
Vậy x = -2
c)( -19 - x) + 23 = -20
(-19 - x) = -20 - 23
-19 - x = -43
x = -19 - (-43)
x = 24
Vậy x - 24
d)(x - 45) : 2 = -17
x - 45 = -17 . 2
x - 45 = -34
x = -34 + 45
x = 11
Vậy x = 11
Bài 1:
a) \(24 - (-15) - 2\)
\(=39-2\)
\(=37\)
b) \((-85) + 10 - (-85) - 50\)
\(=[(-85)-(-85)]+10-50\)
\(=0+10-50\)
\(=10-50\)
\(=-40\)
c) \(71 - (-30) - (+18) + (-30)\)
\(=[(-30)-(-30)]+71-(+18)\)
\(=0+71-18\)
\(=71-18\)
\(=53\)
d) \(-(30) - (+37) + (+37) + (-85)\)
\(=[-(+37)+(+37)]-(30)+(-85)\)
\(=0-(30)+(-85)\)
\(=(-30)+(-85)\)
\(=-115\)
e) \((35-815) - (795-65)\)
\(=(-780)-730\)
\(=-1510\)
g) \((2002-79+15) + (-79+15)\)
\(=1938+(-64)\)
\(=1874\)
Bài 2:
a) \(25 - (30+x) = x - (27-8)\)
\(25-30-x=x-27+8\)
\(x+x=25-30+27-8\)
\(2x=14\)
\(x=14\div2\)
\(x=7\)
b) \((x-12) - 15 = (20-17) - (18+x) \)
\(x-12-15=13-18-x\)
\(x-27=-5-x\)
\(x+x=-5+27\)
\(2x=22\)
\(x=22\div2\)
\(x=11\)
c) \(15 - x = 7 - (-2)\)
\(15-x=9\)
\(x=15-9\)
\(x=6\)
d) \(x - 35 = (-12) - 3\)
\(x-35=-15\)
\(x=-15+35\)
\(x=20\)
e) \(\left|5-x\right|-26=-15\)
\(\left|5-x\right|=-15+26\)
\(\left|5-x\right|=11\)
Từ đây ta có:
*Nếu \(5-x=11\)
\(x=5-11\)
\(x=-6\)
*Nếu \(5-x=-11\)
\(x=5-(-11)\)
\(x=16\)
Vậy \(x=-6;x=16\)
1a) 25 .8 - 12.5 + 272 :17 - 8
= 200 - 60 + 16 - 8
= 140+16-8
= 156 - 8
= 148
b) 125: 25 +14 - 142 : 71
= 5 + 14 - 2
= 19 - 2 = 17
c) 13. 17 - 256: 16 + 14 : 7 - 1
= 221 - 16 + 2 - 1
= 205 + 2 - 1
= 207 - 1 = 206
d) 15 . 24 - 14 . 5 (145 : 5 - 27)
= 360 - 70 (29- 27)
= 360 - 70 . 2
= 360 - 140
= 220
2a) 37 + x = 55
x= 55 - 37
x = 18
b) x- 31 = 24
x = 24 + 31
x = 55
c) 21 (x-11) = 21
x - 11 = 21 : 21
x = 1 +11
x = 12
d ) 9. (x - 29)= 0
x - 29 = 0 :9
x = 29
e) (x - 1954) . 5 = 50
x - 1954 = 50 : 5
x = 1964
f ) 30 . 60 - x = 30
1800 - x = 30
x = 1800 - 30
x = 1770
Viết mỏi tay quá huhuh
a) x = 64 : 8 = 8
b) x = 60 : − 15 = − 4
c)
12 x = 30 − 6 12 x = 24 x = 24 : 12 x = 2
d)
− 11 . x = 130 − 9 − 11 . x = 121 x = 121 : − 11 x = − 11
\(a,45-\left(30+x\right)=x-\left(37-8\right)\)
\(\Leftrightarrow45-30-x=x-37+8\)
\(\Leftrightarrow-x-x=-37+8-45+30\)
\(\Leftrightarrow-2x=-44\)
\(\Leftrightarrow x=22\)
\(b,\left(x-12\right)-15=\left(30-8\right)-\left(40+x\right)\)
\(\Leftrightarrow x-12-15=30-8-40-x\)
\(\Leftrightarrow x+x=30-8-40+12+15\)
\(\Leftrightarrow2x=9\)
\(\Leftrightarrow x=4,5\)