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\(6x-5\left(x-7\right)=\left(27-514\right)-\left(486-73\right)\)
\(\Leftrightarrow6x-5x+35=27-514-486+73\)
\(\Leftrightarrow x=27-514-486+73-35\)
\(\Leftrightarrow x=-935\)
\(a,\)\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(-16=\left(7-x\right)-32\)
\(7-x=-16+32\)
\(7-x=16\)
\(x=7-16=-9\)
\(b,-7624+\left(1543+7624\right)-x=25\)
\(-7624+9167-x=25\)
\(1543-x=25\)
\(x=1543-25\)
\(x=1518\)
\(c,\left(27-514\right)-\left(486-73\right)+x=7\)
\(-487-413+x=7\)
\(-900+x=7\)
\(x=7+900\)
\(x=907\)
Mấy bài thực hiện phép tính bn tự làm nha
3.|x+4|-2.(x-1)=7-2x
3.|x-4|-2x-2=7-2x
=>2.|x-4| =7-2x+2x+2
=>2.|x-4| =9-4x
=>|x-4| =4,5-2x
=>x-4=4,5-2x hoặc x-4=-4,5+2x
2+2x=4,5+4 4,5-4=2x-2
3x =8,5 0,5 =x
x =8,5:3
x =2,833
Vậy x\(\in\){2,833;0,5}
Phần còn lại bn làm tương tự nha
Chúc bn học tốt
1: Ta có: 7x+6(3-x)=27-20+73
\(\Leftrightarrow7x+18-6x=80\)
\(\Leftrightarrow x=80-18=62\)
Vậy: x=62
2: Ta có: \(6x-5\left(x-7\right)=\left(27-514\right)-486-73\)
\(\Leftrightarrow6x-5x+35=27-514-486-73\)
\(\Leftrightarrow x+35=-1046\)
\(\Leftrightarrow x=-1081\)
Vậy: x=-1081
1) 9-25=(7-x)-(25+7)
(7-x)-(25+7)=9-25
(7-x)-(25+7)=-16
(7-x)-32=-16
7-x=-16+32
7-x=16
x=7-16
x=-9
2) (27-514) -(486-73)+x=7
(27-514) -(486-73)+x=7
-487-413+x=7
-1011+x=7
x=7-(-1011)
x=7+1011
x=1018
3) 25+5+37-25+6-29-x=37
25+5+37-25+6-29-x=37
67-25+6-29-x=37
42+6-29-x=37
48-29-x=37
19-x=37
x=19-37
x=-18
4) 14+(-12)+x =10-/-15/+ /-3/
14+(-12)+x =10-15+3
14+(-12)+x =-5+3
14+(-12)+x =-2
2+x=-2
x=-2-2
x=-4
\(2\frac{x}{9}=\frac{75}{27}\)
\(\Rightarrow2+\frac{x}{9}=\frac{75}{27}\)
\(\Rightarrow\frac{x}{9}=\frac{75}{27}-2\)
\(\Rightarrow\frac{x}{9}=\frac{75}{27}-\frac{54}{27}\)
\(\Rightarrow\frac{x}{9}=\frac{21}{27}\)
\(\Rightarrow\frac{x}{9}=\frac{7}{9}\)
\(\Rightarrow x=7\)
\(a,-7624+\left(1543+7624\right)-x=25\)
\(\Leftrightarrow-7624+9167-x=25\)
\(\Leftrightarrow1543-x=25\)
\(\Leftrightarrow x=1518\)
Vậy ................
\(b,\left(27-514\right)-\left(486-73\right)+x=7\)
\(\Leftrightarrow-487-413+x=7\)
\(\Leftrightarrow-900+x=7\)
\(\Leftrightarrow x=907\)
\(c,14-12+x=10-\left|-15\right|+\left|-3\right|\)
\(\Leftrightarrow2+x=10-15+3\)
\(\Leftrightarrow2+x=-2\)
\(\Leftrightarrow x=-4\)
Vậy ....
a) - 7624 + (1543 + 7624) - x = 25
-7624 + 9167 - x = 25
1543 - x = 25
x = 1543 - 25
x = 1518
b) (27 - 514) - (486 - 73) + x = 7
(-487) - 413 + x = 7
-900 + x = 7
x = 7 - (-900)
x = 907
c) 14 - 12 + x = 10 - |-15| + |-3|
14 - 12 + x = 10 - 15 + 3
14 - 12 + x = (-5) + 3
14 - 12 + x = -2
2 + x = -2
x = (-2) - 2
x = -4
\(a,-7624+\left(1543+7624\right)\)
\(=\left[\left(-7624\right)+7624\right]+1543\)
\(=0+1543=1543\)
\(b,\left(27-514\right)-\left(486-73\right)\)
\(=27-514-486+73\)
\(=\left(27+73\right)-\left(514+486\right)\)
\(=100-1000\)
\(=-900\)
Chúc bạn làm bài đạt điểm cao nhé !
a) \(-7624+\left(1543+7624\right)\)
\(=-7624+1543+7624\)
\(=\left(-7624+7624\right)+1543=0+1543=1543\)
b) \(\left(27-514\right)-\left(486-73\right)\)
\(27-514-486+73\)
\(=\left(27+73\right)-\left(514+486\right)=100-1000=-900\)
tk nmk nh. ~học tốt!
Ta có: \(6x-5.\left(x-7\right)=\left(27-514\right)-\left(486-73\right)\)
\(\Leftrightarrow6x-5x+35=-487-413\)
\(\Leftrightarrow x=-900-35\)
\(\Leftrightarrow x=-935\)
Vậy \(x=-935\)
6x-5(x-7)=(27-514)-(486-73)
=>6x-5x+35=-487-413
=>x=-487-413-35
=>x=-935
vậy x=-935