9x² + 3x + 5 . chỉ mik cách giải với
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63 x 45/5 x7
=7 x 9 x 5x9/ 5x 7
=9 x9/1=81
Vậy...
k cho mik nha
a) \(\left|x-3\right|+\left|2x-6\right|=8\)
\(x-3+2x-6=8\)
\(3x-9=8\)
\(3x=17\)
\(\Rightarrow x=\frac{17}{3}\)
b) Tương tự câu a .
c) \(\left|2x-3\right|=6-\left|3-2x\right|\)
\(2x-3=6-3-2x\)
\(2x-3=x\)
\(-2x=3\)
\(x=\frac{-3}{2}\)
d) \(\left|3x-2\right|-\left|6-9x\right|=-\left|-16\right|\)
\(3x-2-6-9x=-16\)
\(3x-8-9x=-16\)
\(-6x-8=-16\)
\(-6x=-8\)
\(\Rightarrow x=\frac{8}{6}\)
\(\)
Câu 1:
\(3x\left(12x+4\right)+9x\left(4x+3\right)\)
\(\Leftrightarrow3x\left(12x+4\right)+3x\left[3.\left(4x+3\right)\right]\)
\(\Leftrightarrow3x\left(12x+4\right)+3x\left(12x+6\right)\)
\(\Leftrightarrow3x\left[12x+4+12x+6\right]\)
\(\Leftrightarrow3x.\left(24x+10\right)\)
\(\Leftrightarrow72x^2+30x\)
Câu 2:
\(x\left(5+2x\right)+2x^2\left(x-1\right)\)
\(\Leftrightarrow5x+2x^2+2x^3-2x^2\)
\(\Leftrightarrow2x^3+5x\)
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