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20 – [30 – (5 – 1)2] = 20 – (30 – 42) = 20 – (30 – 16) = 20 – 14 = 6
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520 : (515.6 + 515.19)
= 520 : [515(6 + 9)]
= 520 : (515.15)
= \(\frac{625}{3}\)
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\(3.\left(-5\right)^2+2.\left(-15\right)-20=3.25-2.15-20=75-30-20=25\)
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#)Giải :
1,25 : 15/20 + 25% - 5/6
= 5/4 : 3/4 + 1/4 - 5/6
= 5/3 + 1/4 - 5/6
= 23/12 - 5/6
= 13/12
#~Will~be~Pens~#
1,25 : \(\frac{15}{20}\)+ 25% - \(\frac{5}{6}\)
= \(\frac{5}{4}\): \(\frac{3}{4}\)+\(\frac{1}{4}\)- \(\frac{5}{6}\)
= \(\frac{5}{4}\)x\(\frac{4}{3}\)+\(\frac{1}{4}\)-\(\frac{5}{6}\)
= \(\frac{5}{3}\)+\(\frac{1}{4}\)-\(\frac{5}{6}\)
= \(\frac{20+3}{12}\)-\(\frac{5}{6}\)
= \(\frac{23}{12}\)-\(\frac{5}{6}\)
= \(\frac{23-10}{12}\)
= \(\frac{13}{12}\)
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