(A x1 -a:1): ( a x 1883+543)
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(a\(\times\)1 - a : 1) :(a x 1883 + 543)
= (a - a) : (a x 1883 + 543)
= 0 : (a x 1883 + 543)
= 0
Vậy (a x 1 - a : 1 ): (a x 1883 + 543) = 0
Hướng dẫn giải:
a.
17 x 543 + 83 x 543
= (17 + 83) x 543
= 100 x 543
= 54300
b.
318 x 963 + 682 x 963
= (318 + 682) x 963
= 1000 x 963
= 963000
a)17x543+83x543
=(17+83)x543
=100x543
=54300
b)318x963+682x963
=(318+682)x963
=1000x963
=963000
a, 197 635 + 81 324
b, 68 543 – 56 627
c, 178 x 241
d, 6420 : 321
\(2\left(x-2\right)\left(x+3\right)-x^2+4=0\)
\(2\left(x^2+3x-2x-6\right)-x^2+4=0\)
\(2x^2+6x-4x-12-x^2+4=0\)
\(x^2+2x-8=0\)
\(x^2+4x-2x-8=0\)
\(x\left(x+4\right)-2\left(x+4\right)=0\)
\(\left(x+4\right)\left(x-2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x+4=0\rightarrow x=\left(-4\right)\\x-2=0\rightarrow x=2\end{cases}}\)
3/
a/ \(2\left(x+1\right)^2-3\left(x-1\right)^2+\left(x+2\right)\left(5-x\right)\)
\(=2\left(x^2+2x+1\right)-3\left(x^2-2x+1\right)+\left(5x-x^2+10-2x\right)\)
\(=2x^2+4x+2-3x^2+6x-3+5x-x^2+10-2x\)
\(=-2x^2+13x+9\)
b/ \(\left(3x-1\right)^3+\left(3x-1\right)^3-6x^2+9\)
\(=2\left(3x-1\right)^3-6x^2+9\)
\(=2\left(\left(3x\right)^3-3\left(3x\right)^2\cdot1+3\cdot3x\cdot1-1\right)-6x^2+9\)
\(=2\left(27x^3-27x^2+9x-1\right)-6x^2+9\)
\(=54x^3-54x^2+18x-2-6x^2+9\)
\(=54x^3-60x^2+18x+7\)
Số hơi dài, nên dễ tính sai -,- tính mik hay cẩu thả có j sai ibbb ạ
\(x+1=7^{542}.7^{543}\)
\(x+1=7^{1085}\)
\(x=7^{1085}-1\)
Câu 3 :
A = 7776 . 8 - 2.243. 64
A = 62208 - 31104
A = 31104
Câu 1 :
a) \(12^5=3^5.4^5\)
b) \(20^6=4^6.5^6\)
c) \(54^3=6^3.9^3\)
Câu 2 :
a) \(3.5^{55}=3.\left(5^5\right)^{11}\)
b) \(4.3^{816}=4.\left(3^{17}\right)^{48}\)
c) \(9.8.7^{6412}=9.8.\left(7^{28}\right)^{229}\)
(129-a).543=51042
129-a=51042:543
129-a=94
a=129-94
a=35
học tốt nha bn
(129-a) x 543 = 51042
=> 129 - a = 51042 :543
=> 129 - a = 94
=> a = 129 - 94
=> a = 35
( a x 1 - a x 1 ) : ( a x 1883 + 543 )
= ( a - a ) : ( a x 1883 + 543 )
= 0 : a x 1883 + 543
= 0 x 1883 + 543
= 0 + 543
= 543.
\(\left(a\times1-a:1\right):\left(a\times1883+543\right)\\ =\left(a-a\right):\left(a\times1883+543\right)\\ =0:\left(a\times1883+543\right)\\ =0\)