a) 199.(15-17)-199.(-17+5)
=199.(-2)-199.(-12)
=199.[(-2)-(-12)]
=199.(-14)
=-2786
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tính
a) \(-39.\left(5-99\right)+99.\left(10-39\right)\)
b) \(79.89-49.\left(-11\right)\)
a.35-17+2017-35+left(-2017right)b.37+left(-17right)-37+77c.-left(-219right)+left(-219right)-401+12d.|-85|-left(-3right).15e.11.107+11.18-25.11f.115-left(-85right)+53-left(-500+53right)g.left(-18right)+left(-31right)+98+|-18|+left(-69right)h.17.left(15-16right)+16.left(17-20right)k.15.left(-176right)+15.76+100.15l.79.89-79.left(-11right)-100.79m.153.177-153.77+100.left(-77right)n.-69.|-45|-31.|45|o.left(-29right).left(85-47right)-85.left(47-29right)p.left(-167right).left(67-34right)-67.left(34-16...
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\(a.35-17+2017-35+\left(-2017\right)\)
\(b.37+\left(-17\right)-37+77\)
\(c.-\left(-219\right)+\left(-219\right)-401+12\)
\(d.|-85|-\left(-3\right).15\)
\(e.11.107+11.18-25.11\)
\(f.115-\left(-85\right)+53-\left(-500+53\right)\)
\(g.\left(-18\right)+\left(-31\right)+98+|-18|+\left(-69\right)\)
\(h.17.\left(15-16\right)+16.\left(17-20\right)\)
\(k.15.\left(-176\right)+15.76+100.15\)
\(l.79.89-79.\left(-11\right)-100.79\)
\(m.153.177-153.77+100.\left(-77\right)\)
\(n.-69.|-45|-31.|45|\)
\(o.\left(-29\right).\left(85-47\right)-85.\left(47-29\right)\)
\(p.\left(-167\right).\left(67-34\right)-67.\left(34-167\right)\)
cứ từ từ mà làm cũng đc
tính nhanh a, frac{-2}{5}cdotleft(frac{5}{17}-frac{9}{15}right)-frac{2}{5}cdotfrac{2}{17}+frac{-2}{5}b, frac{1}{5}cdotleft(frac{4}{13}-frac{9}{11}right)+frac{1}{3}left(frac{9}{13}-frac{4}{22}right)c, left(frac{1}{2}+1right)cdotleft(frac{1}{3}+1right)cdotleft(frac{1}{4}+1right)cdot...cdotleft(frac{1}{99}+1right)d, left(1-frac{1}{2}right)cdotleft(1-frac{1}{3}right)cdotleft(1-frac{1}{4}right)cdot...cdotleft(1-frac{1}{100}right)
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tính nhanh
a, \(\frac{-2}{5}\cdot\left(\frac{5}{17}-\frac{9}{15}\right)-\frac{2}{5}\cdot\frac{2}{17}+\frac{-2}{5}\)
b, \(\frac{1}{5}\cdot\left(\frac{4}{13}-\frac{9}{11}\right)+\frac{1}{3}\left(\frac{9}{13}-\frac{4}{22}\right)\)
c, \(\left(\frac{1}{2}+1\right)\cdot\left(\frac{1}{3}+1\right)\cdot\left(\frac{1}{4}+1\right)\cdot...\cdot\left(\frac{1}{99}+1\right)\)
d, \(\left(1-\frac{1}{2}\right)\cdot\left(1-\frac{1}{3}\right)\cdot\left(1-\frac{1}{4}\right)\cdot...\cdot\left(1-\frac{1}{100}\right)\)
3.Tính hợp lí:a,frac{17}{5}.frac{-31}{125}.frac{1}{2}.frac{10}{17}.frac{-1}{2^3}b,left(frac{11}{4}.frac{5}{9}-frac{4}{9}.frac{11}{4}right).frac{8}{33}c,left(frac{17}{28}+frac{18}{29}-frac{19}{30}-frac{20}{31}right).left(frac{-5}{12}+frac{1}{4}+frac{1}{6}right)4.Tìm tích:a,left(frac{1}{2}+1right)left(frac{1}{3}+1right).....left(frac{1}{99}+1right)b,left(frac{1}{2}-1right)left(frac{1}{3}-1right).....left(frac{1}{100}-1right)c,frac{3}{2^2}.frac{8}{3^2}.frac{15}{4^2}....frac{899}{30^2}AI CÒN THỨC TH...
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3.Tính hợp lí:
a,\(\frac{17}{5}.\frac{-31}{125}.\frac{1}{2}.\frac{10}{17}.\frac{-1}{2^3}\)
b,\(\left(\frac{11}{4}.\frac{5}{9}-\frac{4}{9}.\frac{11}{4}\right).\frac{8}{33}\)
c,\(\left(\frac{17}{28}+\frac{18}{29}-\frac{19}{30}-\frac{20}{31}\right).\left(\frac{-5}{12}+\frac{1}{4}+\frac{1}{6}\right)\)
4.Tìm tích:
a,\(\left(\frac{1}{2}+1\right)\left(\frac{1}{3}+1\right).....\left(\frac{1}{99}+1\right)\)
b,\(\left(\frac{1}{2}-1\right)\left(\frac{1}{3}-1\right).....\left(\frac{1}{100}-1\right)\)
c,\(\frac{3}{2^2}.\frac{8}{3^2}.\frac{15}{4^2}....\frac{899}{30^2}\)
AI CÒN THỨC THÌ GIÚP MIK VS,MIK ĐANG CẦN GẤP
\(\left(\frac{1}{17}-1\right)\left(\frac{2}{17}-1\right)\left(\frac{3}{17}-1\right)...\left(\frac{99}{17}-1\right)\)
Tìm x biết \(\left(x-5\right)^4=\left(x-5\right)^6\)
So Sánh: 2711và 818; 19920 và 200315; 399và 1121
tinh nhanh:\(1+\left(-3\right)+5+\left(-7\right)+9+\left(11\right)+...+\left(-99\right)\)99)
bài 3 thực hiện phép tínhadfrac{5}{8}+dfrac{3}{17}+dfrac{4}{18}+dfrac{20}{-17}+dfrac{-2}{9}+dfrac{21}{56}bleft(dfrac{9}{16}+dfrac{8}{-27}right)+left(1+dfrac{7}{16}+dfrac{-19}{27}right)cleft(dfrac{13}{5}+dfrac{7}{16}right)+left(dfrac{-15}{16}+dfrac{6}{15}right) d left(6-2dfrac{4}{5}right).3dfrac{1}{8}-1dfrac{3}{5}:dfrac{1}{4}
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bài 3 thực hiện phép tính
a\(\dfrac{5}{8}+\dfrac{3}{17}+\dfrac{4}{18}+\dfrac{20}{-17}+\dfrac{-2}{9}+\dfrac{21}{56}\)
b\(\left(\dfrac{9}{16}+\dfrac{8}{-27}\right)+\left(1+\dfrac{7}{16}+\dfrac{-19}{27}\right)\)
c\(\left(\dfrac{13}{5}+\dfrac{7}{16}\right)+\left(\dfrac{-15}{16}+\dfrac{6}{15}\right)\) d \(\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}\)
\(\left(\frac{2}{199}-\frac{3}{398}\right):\frac{17}{199}+\frac{3}{17}\)
\(\left(\frac{-1}{6}+\frac{5}{-12}\right)+\frac{7}{12}\)
\(0.6\times\frac{8}{5}\times30\times0.675\times1\frac{2}{9}\)
\(\frac{43}{27}\left(\frac{27}{43}+\frac{86}{54}\right)-\frac{86}{54}\left(\frac{43}{27}-\frac{27}{43}\right)\)