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\(288-\left(88+5^4\right)-\left(4x^4-200\right)=416\)
\(\Leftrightarrow288-88-625-4x^4+200=416\)
\(\Leftrightarrow-4x^4-225=416\)
\(\Leftrightarrow-4x^4=641\)(vô lý)
1.a) 4.(12+88) = 4.100=400
b)72- 6 .[2.8:8 ]=72-6.[16:8]=72-6 .2= 49-12=37 ( tui ko chắc lắm )
2.a) x=26-11=15
b) (4x-15)3=53
4x-15=5
4x= 5+15
4x=20
vậy x = 20
Bài 2:
a: Ta có: x+11=26
nên x=15
b: Ta có: \(\left(4x-15\right)^3=125\)
\(\Leftrightarrow4x-15=5\)
hay x=5
1
4!+5!
=1.2.3.4+1.2.3.4.5
=24+120=144
2
2!+x=23+5!
2+x=143
x=143-2
vậy x=141
12x+10x=88
x(12+10)=88
x.22=88
x=88:22
vậy x= 4
4!+5!=1.2.3.4+1.2.3.4.5=24+120=144
2!+x=23+5!
1.2+x=23+1.2.3.4.5
2+x=23+120
2+x=143
x=143-2
x=141
Vậy x=141
12x+10x=88
(12+10)x=88
22x =88
x =88:22
x =4
Vây x=4
a)đặt A=1+2+3+...+x
suy ra A=(x+1).x:2=x^2+x:2
mà A=820
suy ra x^2+x=1640
Có x và x+1 là 2 số liên tiếp
Mà 1640=40.41
Suy ra x=40
a) 60-3(x-2)=51
3(x-2)=60-51
3(x-2)=9
x-2 = 9:3
x-2 = 3
x = 3+2
x 5
P(x) + Q(x)= ( x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x) + ( 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4)
= x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x + 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4
= ( x^5 - x^5 ) - ( 2x^2 + 4x^2) + ( 7x^4 + 5x^4) - ( 9x^3 - 2x^3) - 1/4x - 1/4
= 6x^2 + 12x^4 - 6x^3 - 1/4x - 1/4
P(x) - Q(x)= ( x^5 - 2x^2 + 7x^4 - 9x^3 -1/4x) - ( 5x^4 - x^5 + 4x^2 - 2x^3 -1/4)
= x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x - 5x^4 + x^5 - 4x^2 + 2x^3 + 1/4
= ( x^5 + x^5) - ( 2x^2 - 4x^2) + ( 7x^4 - 5x^4) - ( 9x^3 + 2x^3) - 1/4x + 1/4
= 2x^5 - (-2)x^2 + 2x^4 - 11x^3 - 1/4x + 1/4
P(x)=x^5+ 7x^4- 9x^3+ 2x^2-1/4x-0
Q(x)=(-x^5+5x^4- 2x^3+ 4x^2+0x-1/4
= 12x^4-11x^3+ 6x^2-1/4x-1/4
P(x) = x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x
=x5+7x4-9x3-2x2-1/4x
Q(x) = 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4
=-x5+5x4-2x3+4x2-1/4
P(x)+Q(x)=x5+7x4-9x3-2x2-1/4x -x5+5x4-2x3+4x2-1/4
=x5-x5+7x4+5x4-9x3-2x3-2x2+4x2-1/4x-1/4
=12x4-11x3+2x2-1/4x-1/4
P(x)-Q(x)=x5+7x4-9x3-2x2-1/4x +x5-5x4+2x3-4x2+1/4
=x5+x5+7x4-5x4-9x3+2x3-2x2-4x2-1/4x-1/4
=2x5+2x4-7x3-6x2-1/4x-1/4
\(288-\left(88+5^4\right)-\left(4x^4-200\right)=416\)
\(\Leftrightarrow288-88-625-4x^4+200=416\)
\(\Leftrightarrow-4x^4-225=416\)
\(\Leftrightarrow-4x^4=641\)(vô lý)
288 - (88 + 54) - (4x4 - 200) = 416
<=> 288 - 88 - 625 - 4x4 + 200 = 416
<=> 288 - 88 - 625 - 416 + 200 = 4x4
<=> -641 = 4x4
<=> x4 = -160,25
<=> x = \(-\sqrt[4]{160,25}\) = -3,557947288 \(\approx\) -3,56