\(\text{c) 567 x 34 - 567 x 3 - 567}\)

\(\text{= 567 x 34 - 567 x 3 - 567 x 1}\)

\(\text{= 567 x ( 34 - 3 - 1 )}\)

\(\text{= 567 x 30}\)

\(\text{= 17010}\)

\(\text{b) 8 x 27 x 6 + 48 x 72 + 48}\)

\(\text{= (8 x 6) x 27 + 48 x 72 + 48}\)

\(\text{= 48 x 27 + 48 x 72 + 48 x 1 *}\)

\(\text{= 48 x ( 27 + 72 + 1 )}\)

\(\text{= 48 x 100}\)

\(\text{= 4800}\)

\(\text{* Vì một số nhân với 1 thì bằng chính nó, nên 48 x 1 cũng bằng 48.}\)

\(\text{a) 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9}\)

\(=\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5\)

= \(10+10+10+10+5\)

= \(45\)

a) 20 x 6 x 5 x 7

= ( 20 x 5 ) x ( 6 x 7 )

= 100 x 42

= 4200

A = \(\left(-6,17+3\dfrac{5}{9}-2\dfrac{36}{97}\right)\) . \(\left(\dfrac{1}{3}-0,25-\dfrac{1}{12}\right)\)

A = \(\left(-6,17+\dfrac{32}{9}-\dfrac{230}{97}\right)\) . \(\left(\dfrac{1}{3}-\dfrac{1}{4}-\dfrac{1}{12}\right)\)

A = \(\left(-6,17+\dfrac{32}{9}-\dfrac{230}{97}\right)\) . \(\left(\dfrac{4}{12}-\dfrac{3}{12}-\dfrac{1}{12}\right)\)

A = \(\left(-6,17+\dfrac{32}{9}-\dfrac{230}{97}\right)\) . 0

A = 0*

*Vì số nào nhân với 0 cũng bằng 0 nên không cần tính kết quả của phép tính\(\left(-6,17+\dfrac{32}{9}-\dfrac{230}{97}\right)\)

B = \(\left(\dfrac{2}{3}\right)^3\) : \(\left(\dfrac{2}{3}\right)^2\) + \(\left(-1\dfrac{1}{2}\right)\) : 150 %

B = \(\left(\dfrac{2}{3}\right)^{3-2}\) + \(\dfrac{-3}{2}\) : \(\dfrac{3}{2}\)

B = \(\dfrac{2}{3}\) + -1

B = \(\dfrac{-1}{3}\)

A = \(12\dfrac{2}{5}\) . (\(\dfrac{-7}{3}\)) - \(3\dfrac{2}{5}\) . (\(\dfrac{-7}{3}\))

A = (\(\dfrac{-7}{3}\)) . ( \(12\dfrac{2}{5}\) - \(3\dfrac{2}{5}\) )

A = (\(\dfrac{-7}{3}\)) . ( \(\dfrac{62}{5}\) - \(\dfrac{17}{5}\) )

A = (\(\dfrac{-7}{3}\)) . 9

A = \(\dfrac{-7.9}{3}\)

A = \(\dfrac{-63}{3}\) = -21

a. quan hệ nguyên nhân - kết quả.