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Tính nhanh \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
4 bài nhé : A; 0,9times95+1,8times2+0,9 B; frac{subset100times44+50times64supsettimessubset37414,8div1000+2242,52div100supset}{16times14,96times25timessubset27times38+19times146supset} Cfrac{left(4,5times4,8+15times264-2,4times9right)timesleft(15+975,5right)}{1980ti...
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4 bài nhé : A; \(0,9\times95+1,8\times2+0,9\) B; \(\frac{\subset100\times44+50\times64\supset\times\subset37414,8\div1000+2242,52\div100\supset}{16\times14,96\times25\times\subset27\times38+19\times146\supset}\) C\(\frac{\left(4,5\times4,8+15\times264-2,4\times9\right)\times\left(15+975,5\right)}{1980\times1981}\) D;\(\frac{19,8\div0,2\times44,44\times2\times13,20\div0,25}{3,3\times88,88\div0,5\times6,6\div0,125\times5}\)
\(\frac{1}{1\times3}+\frac{1}{3\times5}+\frac{1}{5\times7}+...+\frac{1}{17\times19}\)=
\(\frac{36\times36-2}{2+34\times38}\)
Tính A = \(\frac{1}{2\times9}+\frac{1}{9\times7}+\frac{1}{7\times19}+....+\frac{1}{252\times502}\)
\(\frac{2}{1\times2}+\frac{2}{2\times3}+\frac{2}{3\times4}+...+\frac{2}{18\times19}+\frac{2}{19\times20}\)
Tính nhanh
A =\(\frac{1}{1\times2\times3}\)+\(\frac{1}{2\times3\times4}\)+\(\frac{1}{3\times4\times5}\)+........+\(\frac{1}{36\times37\times38}\)+\(\frac{1}{37\times38\times39}\) GIÚP MK VỚI MK CẦN GẤP
Chứng minh rằng: \(\frac{1}{2\times2}+\frac{1}{3\times3}+\frac{1}{4\times4}+....+\frac{1}{19\times19}+\frac{1}{20\times20}
1\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+............+\frac{1}{99\times100}+\frac{1}{100\times101}\)