tìm X
Tìm số nguyên x , biết: a) x+21=6 B) x-10=-8 c) (-8)x=(-7).(-6)-2. d) 20+8.(x+3)=5².4
\(a,x+21=6\\ \Rightarrow x=-15\\ b,x-10=-8\\ \Rightarrow x=2\\ c,\left(-8\right)x=\left(-7\right)\left(-6\right)\\ \Rightarrow\left(-8\right)x=42\\ \Rightarrow x=-4\\ d,20+8\left(x+3\right)=5^2.4\\ \Rightarrow20+8\left(x+3\right)=25.4\\ \Rightarrow20+8\left(x+3\right)=100\\ \Rightarrow8\left(x+3\right)=80\\ \Rightarrow x+3=10\\ \Rightarrow x=7\)
\(a.x+21=6\\ x=6-21\\ x=-15\\ b.x-10=-8\\ x=-8+10\\ x=2\\ c.-8x=-7.\left(-6\right)-2\\ -8x=42-2\\ -8x=40\\ x=40:\left(-8\right)\\ x=-5\)
\(d.20+8\left(x+3\right)=5^2.4\\ 20+8x+24=25.4\\ 44+8x=100\\ 8x=100-44\\ 8x=56\\ x=56:8\\ x=7\)
a)x+21=6 b)x-10=-8
X=6-21 x=-8+10
X=-15 x=2
C)(-8).x=-7×(-6)-2 d)20+8.(x+3)=5^2.4
(-8).x=40 20+8.(x+3)=100
X=40÷8 8.(x+3)=100-20
X=5 8.(x+3)=80
X+3=80÷8
X+3=10
X=10-3=7
Tìm giá trị của 11 x 10 - 10 x 9 + 9 x 8 - 8 x 7 + 7 x 6 - 6 x 5 + 5 x 4 - 4 x 3 + 3 x 2 - 2 x 1.
11 x 10 - 10 x 9 + 9 x 8 - 8 x 7 + 7 x 6 - 6 x 5 + 5 x 4 - 4 x 3 + 3 x 2 - 2 x 1 = 60
tìm x
-2.(x+6)+6.(x-10)=8
Có:
-2x - 12 + 6x - 60 = 8
=> 4x - 72 = 8
=> 4x = 80
=> x = 20
\(-2\left(x+6\right)+6\left(x-10\right)=8\)
\(\Leftrightarrow-2x-12+6x-60=8\)
\(\Leftrightarrow\left(6x-2x\right)-\left(12+60\right)=8\)
\(\Leftrightarrow4x-72=8\)
\(\Leftrightarrow4x=8+72\)
\(\Leftrightarrow4x=80\)
\(\Leftrightarrow x=\frac{80}{4}\)
\(\Leftrightarrow x=20\)
Trả lời..........
X=20
..............học tốt..............
Tìm x:
X + 5 =8
X + 7 = 10
X + 6 = 18
X + 5 = 8
X = 8 − 5
X = 3
X + 7 = 10
X = 10 − 7
X = 3
X + 6 = 18
X = 18 − 6
X = 12
Tìm x biết : | x+6 | + | x+8 | = 10
Tìm số nguyên x,biết:
(-2).(x-6)+6.(x-10)=8.(-7)
-2.(x-6)+6.(x-10)=8.(-7)
-2x-(-2).6+6x-6.10=-56
-2x+2.6+6x+(-6).10=-56
-2x+6x+12+(-60) =-56
x.(-2+6)+12+(-60) =-56
4x+12+(-60) =-56
4x+12 =-56-(-60)
4x+12 =4
4x =4-12
4x =-8
x =-8:4
x =-2
Tìm số nguyên x biết: x - 10 = (-8) - 6
6-8+10-12+...-x=-200
1-5+9-13+...-x=-400
-8+13-...+x=250
1-3+5-7+...-x=-600
-2+4-6+8-...+x=100
2-6+10-14+...-x=-800
Ai trả lời hộ em bài tìm x trên với ạ
6 - 8 + 10 - 12 + ... - x = - 200
( 6 - 8 ) +( 10 - 12 ) + ... + ( x - 2 - x ) = - 200
( - 2 ) + ( - 2 ) + ... + ( - 2 ) = - 200 ( Có ( x - 6 ) : 2 + 1 = x : 2 - 3 + 1 = x : 2 - 2 số hạng - 2 )
( - 2 ) x x : 2 - 2 = 200
( - 2 ) x x : 2 = 202
x = - 202
Tìm x biết
x÷(2×2)+x÷(4×3)+x÷(6×4)+x÷(8×5)+x÷(10×6)