Tính A biết:Cho biểu thức A=\(1+2^1+2^1+2^2+2^3+...+2^{2021}\)
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\(\left(-3\right).\left(x+1\right)=36\)
\(-3x-3=36\)
\(-3x=36+3\)
\(-3x=39\)
\(-x=39:3\)
\(x=-13\)
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TL:
5 . (x + 1) + 75 = 0
5 . (x + 1) = 0 - 75
5 . (x + 1) = -75
x + 1 = -75 : 5
x + 1 = -15
x = -15 - 1
x = -16
HT
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128 x 273 - 128 x 302 + 278 x 302 - 128 + 278
= 128 x ( 273 + 302 ) + 278 x ( 302 + 128 )
= 128 x 575 + 278 x 428
= 73600 + 546984
= 44460
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C1: \(M=\left\{11;12;13;14;15;16;17;18;19\right\}\)
C2: \(M=\left\{11\le x< 20|x\inℕ\right\}\)
C1: M= {11;12;13;14;15;16;17;18;19;20}
C2: M= {x thuộc N*/11<=x<=20}
đúng thì cho mk xin k nha bn
chúc bn hok tốt
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2.3x=10.274+8,274
2.3x=274.(10+8)
2.3x=274.18
3x=274.(18:2)
3x=274.9
3x=312.32
3x=314
=>x=14
vậy x=14
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\(3x+2=3x-9+11=3\left(x-3\right)+11⋮\left(x-3\right)\Leftrightarrow11⋮\left(x-3\right)\)
\(\Leftrightarrow x-3\inƯ\left(11\right)=\left\{-11,-1,1,11\right\}\Leftrightarrow x\in\left\{-8,2,4,14\right\}\).