xx-y-xx+y÷yx-y-yx+y+x+yx-y+x-yx+y÷x+yx-y-x-yx+y (সরল কর)

$\frac{3 x^{2}}{2 a}, \frac{4 y^{2}}{15 z x}$

386

উত্তরঃ

$\frac{3 x^{2}}{2 a} \div \frac{4 y^{2}}{15 z x} = \frac{3 x^{2}}{2 a} \times \frac{15 z x}{4 y^{2}} = \frac{45 z x^{3}}{8 a y^{2}}$

Affan Ahmed

8 months ago

386

(খ)

$\frac{9 a^{2} b^{2}}{4 c^{2}}, \frac{16 a^{3} b}{3 c^{3}}$

(ভাগ কর)

অষ্টম শ্রেণি গণিত অনুশীলনী ৫.২

383

উত্তরঃ

$\frac{9 a^{2} b^{2}}{4 c^{2}} \div \frac{16 a^{3}}{3 c^{3}} = \frac{9 a^{2} b^{2}}{4 c^{2}} \times \frac{3 c^{3}}{16 a^{3}} = \frac{27 b c}{64 a}$

Affan Ahmed

8 months ago

383

(গ)

$\frac{21 a^{4} b^{4} c^{4}}{4 x^{3} y^{3} z^{3}}, \frac{7 a^{2} b^{2} c^{2}}{12 x y z}$

(ভাগ কর)

অষ্টম শ্রেণি গণিত অনুশীলনী ৫.২

410

উত্তরঃ

$\frac{21 a^{4} b^{4} c^{4}}{4 x^{3} y^{3} z^{3}} \div \frac{7 a^{2} b^{2} c^{2}}{12 x y z}$

$= \frac{21 a^{4} b^{4} c^{4}}{4 x^{3} y^{3} z^{3}} \times \frac{12 x y z}{7 a^{2} b^{2} c^{2}} = \frac{9 a^{2} b^{2} c^{2}}{x^{2} y^{2} z^{2}}$

Affan Ahmed

8 months ago

410

(ঘ)

$\frac{x}{y}, \frac{x + y}{y}$

(ভাগ কর)

অষ্টম শ্রেণি গণিত অনুশীলনী ৫.২

455

উত্তরঃ

$\frac{x}{y} \div \frac{x + y}{y}$

$= \frac{x}{y} \times \frac{y}{x + y}$

$= \frac{x}{x + y}$

Affan Ahmed

8 months ago

455

(ঙ)

$\frac{{(a + b)}^{2}}{{(a - b)}^{2}}, \frac{a^{2} - b^{2}}{a + b}$

(ভাগ কর)

অষ্টম শ্রেণি গণিত অনুশীলনী ৫.২

386

উত্তরঃ

$\frac{{(a + b)}^{2}}{{(a - b)}^{2}} \div \frac{a^{2} - b^{2}}{a + b}$

$= \frac{{(a + b)}^{2}}{{(a - b)}^{2}} \times \frac{a + b}{a^{2} - b^{2}}$

$= \frac{{(a + b)}^{2} (a + b)}{{(a - b)}^{2} (a + b) (a - b)}$

$= \frac{{(a + b)}^{2}}{{(a - b)}^{3}}$

Affan Ahmed

8 months ago

386

(চ)

$\frac{x^{3} - y^{3}}{x + y}, \frac{x^{2} + x y + y^{2}}{x^{2} - y^{2}}$

(ভাগ কর)

অষ্টম শ্রেণি গণিত অনুশীলনী ৫.২

429

উত্তরঃ

$\frac{x^{3} - y^{3}}{x + y} \div \frac{x^{2} + x y + y^{2}}{x^{2} + y^{2}}$

$= \frac{(x - y) (x^{2} + x y + y^{2})}{x + y} \times \frac{x^{2} + y^{2}}{x^{2} + x y + y^{2}}$

$= \frac{(x - y) (x^{2} + x y + y^{2}) (x + y) (x - y)}{(x + y) (x^{2} + x y + y^{2})} = {(x - y)}^{2}$

Affan Ahmed

8 months ago

429

$(\frac{x}{x - y} - \frac{x}{x + y}) \div (\frac{y}{x - y} - \frac{y}{x + y}) + (\frac{x + y}{x - y} + \frac{x - y}{x + y}) \div (\frac{x + y}{x - y} - \frac{x - y}{x + y})$
(সরল কর)

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