thực hiện phép tính
1)(3104-985)-(115+3104)
2)78*(-153)+153*178
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1, 3/5 + -4/15 = \(\dfrac{9}{15}\)+ \(\dfrac{-4}{15}\)= \(\dfrac{5}{15}\)= \(\dfrac{1}{3}\)
2, -1/3 + 2/5 + 2/15= \(\dfrac{-5}{15}+\dfrac{6}{15}+\dfrac{2}{15}\)=\(\dfrac{3}{15}=\dfrac{1}{5}\)
3, -3/5 + 7/21 + -4/5 + 7/5= \(\dfrac{1}{3}\)
\(1.\dfrac{3}{5}+\dfrac{-4}{15}=\dfrac{9}{15}+\dfrac{-4}{15}=\dfrac{5}{15}=\dfrac{1}{3}\)
\(2.\dfrac{-1}{3}+\dfrac{2}{5}+\dfrac{2}{15}=\dfrac{-5}{15}+\dfrac{6}{15}+\dfrac{2}{15}=\dfrac{3}{15}=\dfrac{1}{5}\)
\(3.\dfrac{-3}{5}+\dfrac{7}{21}+\dfrac{-4}{5}+\dfrac{7}{5}=\left(\dfrac{-3}{5}+\dfrac{-4}{5}+\dfrac{7}{5}\right)+\dfrac{7}{21}=0+\dfrac{7}{21}=\dfrac{1}{3}\)
a) 13 15 : 39 25 = 13 15 . 25 39 = 5 9
b) 2 9 : 27 4 = 2 9 . 4 27 = 8 243
c) − 7 8 : ( − 3 ) = − 7 8 . − 1 3 = 7 24
d) − 1 : 11 5 = − 1. 5 11 = − 5 11
1) Ta có: \(\left(3104-985\right)-\left(115+3104\right)\)
\(=3104-985-115-3104\)
\(=-1000\)
2) Ta có: \(78\cdot\left(-153\right)\cdot153\cdot78\)
\(=78\cdot\left(-153+153\right)=78\cdot0=0\)
1: (3104 - 985) - (115 + 3104) = 3104 - 985 - 115 - 3104
= -1100
2: 78 . (-153) + 153 . 178 = 78 . ( -153 + 153 ) . 178
= 78 . 0 .178
= 0