Quiz about 17 30 1 часть февраль

Question 1

$$6.4 imes\left(2-3x ight)=6 imes\left(0.8x-1 ight)+6.8$$

Accepted Answer

$$0.5$$

Answer

2.5

Answer

5

Answer

1.5

Question 2

$$\left(4x-3\right)^2-x\left(4x+1\right)$$

Accepted Answer

$$12x^2-25x+9$$

Answer

$$8x^2-x+7$$

Answer

$$12x^2-23x+9$$

Answer

$$4x^2-13x$$

Question 3

$$\left(18\ \frac{1}{3}+x\right)\div3\ \frac{1}{7}=7$$

Accepted Answer

$$3\ \frac{2}{3}$$

Answer

$$2\ \frac{2\ }{4}$$

Answer

$$4\ \frac{6\ }{4}$$

Answer

$$4\ \frac{1}{3}$$

Question 4

$$\frac{3x-11}{4}-\frac{3-5x}{8}=\frac{x-6}{2}$$

Accepted Answer

$$\frac{1}{7}$$

Answer

$$5$$

Answer

$$6.5$$

Answer

$$7$$

Question 5

$$\frac{0.2^2-2 imes0.06+0.3^2}{0.05 imes0.9-0.05}$$

Accepted Answer

-2

Answer

-0.2

Answer

-1

Answer

0.25

Question 6

$$889^3+3000 imes889 imes111+111^3+889+111$$

Accepted Answer

$$1000001000$$

Answer

$$100010000$$

Answer

$$1001011000$$

Answer

$$1001001000$$

Question 7

$$\frac{a^2+ab+b^2}{b^3-a^3}+\frac{a^2-ab+b^2}{b^3+a^3}$$

Accepted Answer

$$\frac{2b}{b^2-a^2}$$

Answer

$$\frac{2a}{a^2-b^2}$$

Answer

$$\frac{a}{b^2-a^2}$$

Answer

$$\frac{b}{b^2-a^2}$$

Question 8

$$\frac{x^3-2x^2}{3x+3}\div\frac{x^2-4}{3x^2+6x+3}$$

Accepted Answer

$$\frac{x^3+x^2}{x+2}$$

Answer

$$\frac{x^2\left(x-1\right)}{x+2}$$

Answer

$$\frac{x^2\left(x-1\right)}{2-x}$$

Answer

$$\frac{x+2}{x^2\left(x+1\right)}$$

Question 9

$$\left(\frac{2x}{x-5}+\frac{x}{x^2-10x+25}\right)\div\frac{2x-9}{x^2-25}-\frac{5\left(x+5\right)}{x-5}$$

Accepted Answer

5+x

Answer

x-5

Answer

5

Answer

3+x

Question 10

$$\frac{3x}{x+2}+\frac{5}{x-2}=\frac{7x+4}{x^2-4}$$

Accepted Answer

$$\phi$$

Answer

35

Answer

27

Answer

5

Question 11

$$a^3+27b^9$$

Accepted Answer

$$\left(a+3b^3\right)\left(a^2-3ab^3+9b^6\right)$$

Answer

$$\left(a-3b^3\right)\left(a^2+3ab^3+9b^6\right)$$

Answer

$$\left(a+b^3\right)\left(a^2-ab^3+9b^6\right)$$

Answer

$$\left(a+3b^3\right)\left(a^2-6ab^3+9b^6\right)$$

Question 12

$$\left(-0.5b^2 ight)^3 imes5b$$

Accepted Answer

$$-\frac{5}{8}b^7$$

Answer

$$-\frac{1}{4}b^5$$

Answer

$$\frac{6}{8}b^7$$

Answer

$$\frac{8}{9}b$$

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