12 x 7 + 12 x 3 =?
d) (12x -1) (2x -3);e) (x -7)(x -5);f) (x -12)(x + 12)(4x -1)d) (12x -1) (2x -3);e) (x -7)(x -5);f) (x -12)(x + 12)(4x -1)
\(d,=24x^2-38x+3\\ e,=x^2-12x+35\\ f,=\left(x^2-144\right)\left(4x-1\right)=4x^3-x^2-576x+144\)
d: \(\left(12x-1\right)\left(2x-3\right)\)
\(=24x^2-36x-2x+3\)
\(=24x^2-38x+3\)
-7/12 x 3/8 + -7/12 x 5/8 + 1 7/12 =
\(-\dfrac{7}{12}\cdot\dfrac{3}{8}+-\dfrac{7}{12}\cdot\dfrac{5}{8}+1\dfrac{7}{12}\)
\(=-\dfrac{7}{12}\cdot\left(\dfrac{3}{8}+\dfrac{5}{8}-1\right)\)
\(=-\dfrac{7}{12}\cdot\left(\dfrac{8}{8}-1\right)\)
\(=-\dfrac{7}{12}\cdot\left(1-1\right)\)
\(=-\dfrac{7}{12}\cdot0\)
\(=0\)
x-75%x=-2,5
x\7=x-12\21
-3|x|=-2\3
0,5x-2\3x=7\12
x\8=-7\y=z\-18=-6\12
Tính:
7/12 x 3/7 + 7/12 x 4/7
\(=\dfrac{7}{12}\times\left(\dfrac{3}{7}+\dfrac{4}{7}\right)=\dfrac{7}{12}\times\dfrac{7}{7}=\dfrac{7}{12}\)
`7/12xx3/7+7/12xx4/7=7/12xx(3/7+4/7)=7/12xx7/7=7/12`
\(\dfrac{7}{12}.\dfrac{3}{7}+\dfrac{7}{12}.\dfrac{4}{7}=\dfrac{7}{12}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)=\dfrac{7}{12}\)
a) -12+(x-9)<0 tìm x thuộc Z
b)x-(13-x)=-24+(-7+x)
c) (x - 7)+( 5-x)=12-(-8+x)
d)5(x-6)-2(x+3)=12
e)3(x-4)-(8-x)=12
f) 7(x-3)-5(3-x)=11x-5
g) 7(x-9)-5(6-x)=-6+11x
a) -12+(x-9)<0 tìm x thuộc Z
b)x-(13-x)=-24+(-7+x)
c) (x - 7)+( 5-x)=12-(-8+x)
d)5(x-6)-2(x+3)=12
e)3(x-4)-(8-x)=12
f) 7(x-3)-5(3-x)=11x-5
g) 7(x-9)-5(6-x)=-6+11x
Bài 4: Tìm số nguyên x biết:
a) 3x + 27 = 9 b) 2x + 12 = 3(x – 7)
c) 2x2 – 1 = 49 d) |-9 – x| -5 = 12
b) 2x + 12 = 3(x – 7)
d) |-9 – x| -5 = 12
12 x 1 =
12 x 2 =
12 x 3 =
12 x 4 =
12 x 5 =
12 x 6 =
12 x 7 =
12 x 8 =
12 x 9 =
12 x 10 =
12 x 1 = 12
12 x 2 = 24
12 x 3 = 36
12 x 4 = 48
12 x 5 = 60
12 x 6 = 72
12 x 7 = 84
12 x 8 = 96
12 x 9 = 108
12 x 10 = 120
Chúc bạn học tốt!!! ^_^
12 x 1 = 12
12 x 2 = 24
12 x 3 = 36
12 x 4 = 48
12 x 5 = 60
12 x 6 = 72
12 x 7 = 84
12 x 8 = 96
12 x 9 = 108
12 x 10 = 120
nhớ tk cho mk nha !
12 x 1 =12
12 x 2 = 24
12 x 3 = 36
12 x 4 =48
12 x 5 =60
12 x 6 = 72
12 x 7 =84
12 x 8 =96
12 x 9 =108
12 x 10 =120
Giá trị X trong biểu thức 4/7 x X = 1/3 A 7/12 B 4/21 C 12/7 D 3/21
\(25\dfrac{3}{5}\)x\(\dfrac{7}{12}\)-\(31\dfrac{3}{5}\)x\(\dfrac{7}{12}\)
\(=\dfrac{7}{12}\cdot\left(25\dfrac{3}{5}-31\dfrac{3}{5}\right)=\dfrac{7}{12}\left(-6\right)=-\dfrac{7}{2}\)