Tìm x,biết:
(x3+12):4=60+(-3)
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\(\Leftrightarrow x^3=57\cdot14-12=786\)
hay \(x=\sqrt[3]{786}\)
\(\left(x^3+12\right):14=60+\left(-3\right)\\ x^3+12=798\\ x^3=786\\ x=\sqrt{786}\)
a) x = 4
b) x = 3
c) x = 2
d) x = 1
e) x = 3
f) x = 2
g) x = 4
h) x = 3
a, 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 2 x 12 x 31 + 4 x 6 x 42 + 8 x 3 x 27
= 24 x 31 + 24 x 42 + 24 x 27
= 24 x ( 31 + 24 + 27 )
= 24 x 82
= 1968
b, 2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
= 24 x 53 + 24 x 87 - 24 x 40
= 24 x ( 53 + 87 - 40 )
= 24 x 100
= 2400
c, Tương tự
a: 7x+58=100
nên 7x=42
hay x=6
c: x-56:x=16
nên x-14=16
hay x=30
c)x - 56 : 4 = 16
x - 56 = 16 : 4
x- 56 = 4
x =4 + 56
x = 60
d)101 + (36 - 4x) = 105
(36- 4x ) = 105 - 101
36 - 4x = 4
4x = 36 - 4
4x = 32
x = 32:4
x = 8
a) (x-2)3+6(x+1)2-x3+12=0
\(\Rightarrow\)x3-6x2+12x-8+6(x2+2x+1)-x3+12=0
\(\Rightarrow\)x3-6x2+12x-8+6x2+12x+6-x3+12=0
\(\Rightarrow\)24x+10=0
\(\Rightarrow\)24x=-10
\(\Rightarrow\)x=\(\dfrac{-10}{24}=\dfrac{-5}{12}\)
b)(x-5)(x+5)-(x+3)2+3(x-2)2=(x+1)2-(x-4)(x+4)+3x2
\(\Rightarrow\)x2-25-(x2+6x+9)+3(x2-4x+4)=x2+2x+1-(x2-16)+3x2
\(\Rightarrow\)x2-25-x2-6x-9+3x2-12x+12=x2+2x+1-x2+16+3x2
\(\Rightarrow\)3x2-18x-22=3x2+2x+17
\(\Rightarrow\)3x2-18x-22-3x2-2x-17=0
\(\Rightarrow\)-20x-39=0
\(\Rightarrow\)-20x=39
\(\Rightarrow\)x=\(-\dfrac{39}{20}\)
8 x 3 + 12 x 2 + 6x + 1 = 0
2 x 3 + 3. 2 x 2 .1 + 3.(2x). 1 2 + 1 3 = 0
2 x + 1 3 = 0
2x + 1 = 0
x = (-1)/2
(x^3+12):4=57
x^3+12 =57.4
x^3+12 =228
x^3 =228-12
x^3 =217
ma so 217 khong viet duoc duoi dang binh phuong cua mot so tu nhien
=>khong tim duoc gia tri cua x
TIN CHI DI CHI HOC LOP 7 DO
=> (x3+12):4= 57
=> x3+12=57.4
=> x3+12=228
=> x3=228-12
=> x3=216
=> x3=63
=> x=6