Tìm X biết: 79 – (X – 18) = 37
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a) 120 - ( x + 14 ) = 45
x + 14 = 120 - 45
x + 14 = 75
x = 75 - 14
x = 61
b) 79 - x - 18 = 37
79 - x = 37 + 18
79 - x = 55
x = 79 - 55
x = 24
(-7).\(x\) = -37 + 79
-7\(x\) = 42
\(x\) = 42: (-7)
\(x\) = -6
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 \(x=-6;x=16\)
6.x - 37 = 1818 : 18 x : 23 + 45 = 270
6.x - 37 = 101 x : 23 = 270 - 45
6.x = 101 + 37 x : 23 = 225
6.x = 138 x = 225 x 23
x = 138 : 6 x = 5175
x = 23
a) \(6x-37=1818:18\)
\(\Rightarrow6x-37=101\)
\(\Rightarrow6x=101+37\)
\(\Rightarrow6x=138\)
\(\Rightarrow x=138:6=23\)
b) \(x:23+45=270\)
\(x:23=270-45\)
\(x:23=225\)
\(x=225\cdot23\)
\(x=5175\)
49 x 37 = 37 x 49
(214 x 25) x 4 = 214 x (25 x 4)
103 x 18 + 103 x 12 = 103 x (18 + 12)
79 - (x - 18) = 37
x - 18 = 79 - 37
x - 18 = 42
x = 42 + 18
x = 60
79 - ( x-18 ) = 37
x-18 = 79 - 37
x-18 = 42
x = 42 + 18
x = 60