Bài làm
\(-\frac{3}{7}.4\left(2,1y^2-0,7x+35\right)\)
\(=-\frac{12}{7}\left(2,1y^2-0,7x+35\right)\)
\(=\frac{-12}{7}.\left(\frac{21}{10}y^2\right)+\frac{12}{7}.\left(\frac{7}{10}x\right)-\frac{12}{7}.35\)
\(=\frac{-18}{5}y^2+\frac{6}{5}x-60\)
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Bài làm
\(-\frac{3}{7}x^4\left(2,1y^2-0,7x+35\right)\)
\(=-\frac{3}{7}x^4.\frac{21}{10}y^2+\frac{3}{7}x^4.\frac{7}{10}x-\frac{3}{7}x^4.35\)
\(=-\frac{9}{5}x^4y^2+\frac{3}{10}x^5-105x^4\)
\(=x^4\left(-\frac{9}{5}y^2+\frac{3}{10}x-105\right)\)
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