17x-28=12x-(-42)
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Đáp án:
17x-28=12x-(-42)
17x-28=12x+42
17x-12x=42+28
5x=70
x=70/5
x=14.
Chúc bạn học tốt^^
Bài làm
17x - 28 = 12x - ( -42 )
=> 17x - 28 = 12x + 42
=> 17x - 12x = 42 + 28
=> 5x = 70
=> x = 14
Vậy x = 14
\(17x-28=12x-\left(-42\right)\)
\(17x-28=12x+42\)
\(17x-12x=42+28\)
\(5x=70\)
\(x=14\)
Vậy \(x=14\)
Ngu!
17x-28=12x-(-42)
17x-28=12x+42
5x-28=42
5x=24+42
5x=70
x=70/5
x=14
a)102-(x-3)=43
=>100-(x-3)=64
=>x-3=100-64
=>x-3=36
=>x=36+3
=>x=39
b)252-(17x+82)=152+132
=>625-(17x+82)=225+132
=>625-(17x+82)=375
=>17x+82=625-375
=>17x+82=250
=>17x=250-82
=>17x=168
=>x=168:17
=>x=168/17
c)202-(282-12x)=62
=>40-(784-12x)=36
=>784-12x=40-36=4
=>12x=784-4=780
=>x=780:12=65
`G(x)+H(x)=(21x^2+1+17x)+(-2+6x^3-12x^2-8)`
`=21x^2+1+17x-2+6x^3-12x^2-8`
`= 6x^3+(21x^2-12x^2)+17x+(1-2-8)`
`= 6x^3+9x^2+17x-9`
`G(x)-H(x)=(21x^2+1+17x)-(-2+6x^3-12x^2-8)`
`= 21x^2+1+17x+2-6x^3+12x^2+8`
`= -6x^3+(21x^2+12x^2)+17x+(1+2+8)`
`= -6x^3+33x^2+17x+11`
`----`
`M(x)+N(x)=(7x^5 + 1 + 17x^4 - 2)+(6x^4 - 12x^2 - 23x^4 + x)`
`= 7x^5 + 1 + 17x^4 - 2+6x^4 - 12x^2 - 23x^4 + x`
`= 7x^5+(17x^4+6x^4-23x^4)-12x^2+x+(1-2)`
`= 7x^5-12x^2+x-1`
`M(x)-N(x)=(7x^5 + 1 + 17x^4 - 2)-(6x^4 - 12x^2 - 23x^4 + x)`
`= 7x^5 + 1 + 17x^4 - 2-6x^4 + 12x^2 + 23x^4 - x`
`= 7x^5+(17x^4-6x^4+23x^4)+12x^2-x+(1-2)`
`= 7x^5+34x^4+12x^2-x-1`
Mình đã trl rồi nha!
(https://hoc24.vn/cau-hoi/tinh-tong-avf-hieu-cac-da-thuc-saugx-21x2-1-17x-va-hx-2-6x3-12x2-8mx-7x5-1-17x4-2-va-nx-6x4-12x2-23x4-x.7858748287383)
\(\Leftrightarrow-12x+17x=20+2\\ \Leftrightarrow5x=22\\ \Leftrightarrow x=\dfrac{22}{5}\)
\(15x+3-4x=17x-12x+43\)
\(\Leftrightarrow15x-4x+3=x\left(17-12\right)+43\)
\(\Leftrightarrow x\left(15-4\right)+3=5x+43\)
\(\Leftrightarrow11x+3=5x+43\)
\(\Leftrightarrow6x=40\)
\(\Leftrightarrow x=40\div6\)
\(\Leftrightarrow x=\frac{40}{6}\)
\(\Leftrightarrow x=\frac{20}{3}\)
trả lời nhanh hộ mk vs
17x - 29 = 12x - (-42 )
17x - 12x = 29 - ( -42 )
5x = 29 + 42
5x = 71
x = 71 : 5
x = \(\frac{71}{5}\)