\(\Leftrightarrow20+8\left(x+3\right)=100\\ \Leftrightarrow8\left(x+3\right)=80\\ \Leftrightarrow x+3=10\\ \Leftrightarrow x=7\)
tìm x:
8.(x-6)+4.(x-3)-2.(+7)=-x+4
-7.(8-x)-6.(9+x)=20-x
9.(x-7)-20.(4-3x)=-7x+15
-16.(6+x)-30.(2-x)=-40x-16
17.(x-6)-14.(x+2)=4.(x-6)-2.(x-2)
mn giải giúp mình vs ạ.Mình đang cần gấp!!!!
5 x 8-(9+x)=20
x=
Bài 1 : Tính :
a)-|-5+3-7|-|-5+7
b)24-(72-13+24)-(72-13)
c)|4-9-5|-(4-9-5)-15+9
d)-20-(25-11+8)+(25-8+20)
e)|-5+7-8|-(-5+7-8)
f) (-20+10-3)-(-20+10)+27
g)13-[5-(4-5)+6]-[3-(2-7)]
h) (14-12-7)-[-(-3+2)+(5-9)]
i)14-23+(5-14)-(5-23)+17
|
a)-|-5+3-7|-|-5+7| b)24-(72-13+24)-(72-13) c)|4-9-5|-(4-9-5)-15+9 d)|-5+7-8|-(-5+7-8) e) (-20+10-3)-(-20+10)+27 f)13-[5-(4-5)+6]-[3-(2-7)] g) (14-12-7)-[-(-3+2)+(5-9)] h)14-23+(5-14)-(5-23)+17 |
|
a, x+ 15 : 3 = 8
25+3.(x-8)=106
Tính tổng
a) 1+3+5+...+999
b) 1+7+8+15+...+160
Tìm x biết:
(x+1)+(x+2)+(x+3)+...+(x+9)=135
Bài thêm:
1+2+3+...+x=55
Tim x€n
a.72.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
{\(x\)2-[62-(82-9.7)3-7.5]3-5.3}3=1
