Bài 1: Thực hiện phép tính:

1) \(\dfrac{-17}{30}-\dfrac{11}{-15}+\dfrac{-7}{12}\)

2) \(\dfrac{-5}{9}+\dfrac{5}{9}:\left(1\dfrac{2}{3}-2\dfrac{1}{12}\right)\)

3) \(\dfrac{-7}{25}.\dfrac{11}{13}+\dfrac{-7}{25}.\dfrac{2}{13}-\dfrac{18}{25}\)

Tìm x, biết:

a) \(\left(3\dfrac{1}{2}-2.x\right).3\dfrac{1}{3}=7\dfrac{1}{3}\)

b) \(\dfrac{4}{9}.x=\dfrac{9}{8}-0,125\)

c) \(\dfrac{-X}{21}=\dfrac{20}{7}\)

Thực hiện phép tính:

b) \(\left(\dfrac{-5}{24}+0,75+\dfrac{7}{12}\right):\left(-2\dfrac{1}{4}\right)\)

Tìm x, biết:

a) \(\left(3\dfrac{1}{2}+2x\right).2\dfrac{2}{3}=5\dfrac{1}{3}\)

b) \(\left(2x+3\right)=5\)

c) \(\dfrac{x-2}{4}=\dfrac{5+x}{3}\)

Thực hiện phép tính (tính nhanh nếu có thể)

a) -19+7+9+19

b) \(11\dfrac{3}{13}-\left(2\dfrac{4}{7}+5\dfrac{3}{13}\right)\)

c) \(\dfrac{2}{7}.5\dfrac{1}{4}-\dfrac{2}{7}.3\dfrac{1}{4}\)

Tìm x biết:

1/ \(\dfrac{3}{5}-x=0,2\)

2/ \(\dfrac{x}{3}-\dfrac{1}{8}=\dfrac{5}{8}\)

3/ \(3\dfrac{1}{3}.x-6\dfrac{3}{4}=3\dfrac{1}{4}\)

Thực hiện phép tính.(tính nhanh nếu có thể)

1/ \(2\dfrac{1}{3}.3\)

2/ \(\left(\dfrac{2}{5}-\dfrac{3}{4}\right)-\dfrac{2}{5}\)

3/ \(\dfrac{-10}{11}.\dfrac{4}{7}+\dfrac{-10}{11}.\dfrac{3}{7}+1\dfrac{10}{11}\)