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Chứng tỏ tran quoc nam nói 1 đằng mà làm 1 nẻo
\(-\dfrac{3}{4}.31\dfrac{11}{23}-0,75.8\dfrac{12}{23}\)
\(=-\dfrac{3}{4}.31\dfrac{11}{23}-\dfrac{3}{4}.8\dfrac{12}{23}\)
\(=-\dfrac{3}{4}.\left(31+\dfrac{11}{23}+8+\dfrac{12}{12}\right)\)
\(=-\dfrac{3}{4}.\left(31+8+1\right)\)
\(=-\dfrac{3}{4}.40\)
\(=-3.10\)
\(=-30\)
- \(\dfrac{3}{4}\).31\(\dfrac{11}{23}\) - 0,75.8\(\dfrac{12}{23}\)
= - \(\dfrac{3}{4}\).\(\dfrac{724}{23}\) - \(\dfrac{3}{4}\)\(\dfrac{196}{23}\)
= - \(\dfrac{3}{4.23}.\left(724+196\right)\)
= - \(\dfrac{3}{92}\) . 920
= - 30
\(-\dfrac{3}{4}.31\dfrac{11}{23}-0,75.8\dfrac{11}{23}\)
\(=\dfrac{3}{4}.\left(-31\dfrac{11}{23}\right)-\dfrac{3}{4}.8\dfrac{11}{23}\)
\(=\dfrac{3}{4}.\left(-31\dfrac{11}{23}-8\dfrac{11}{23}\right)\)
\(=\dfrac{3}{4}.\left(-39\right)\)
\(=-\dfrac{117}{4}\)
a. -3/4 x 12/-5 x (-25/6)=-15/2
b. -2 x -38/21 x -7/4 x (-3/8)=-19/8
c. (11/12: 33/16) x 3/5=4/15
d. 7/23 x [(-8/6)- 45/18]=-7/6
1: \(\dfrac{4}{23}+\dfrac{5}{21}+\dfrac{1}{2}-\dfrac{4}{23}+\dfrac{16}{21}\)
\(=1+\dfrac{1}{2}\)
\(=\dfrac{3}{2}\)
2: \(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\)
\(=\dfrac{1}{3}\)
- \(\dfrac{3}{4}\) x 31\(\dfrac{11}{23}\) - 0,75 x 8\(\dfrac{12}{23}\)
= - \(\dfrac{3}{4}\) x \(\dfrac{724}{23}\) - 0,75 x \(\dfrac{196}{23}\)
= - \(\dfrac{543}{23}\) - \(\dfrac{147}{23}\)
= - \(\dfrac{690}{23}\)
= -30