tinh nhanh
202 * 56 + 4 + 202
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{ 2019 - [ -521]} - {202 + 521} + {-456 + 202}
= 2019 + 521 - 202 - 521 + -456 + 202
= 2019 + (521 - 521) + (-202 + 202) + -456
= 2019 + 0 + 0 + -456
= 2019 + -456
= 1563
[2019 - (-521)] - (202 + 521) + (-456 + 202)
= 2019 + 521 - 202 - 521 - 456 + 202
= (2019 - 456) + (521 - 521) - (202 - 202)
= 1563
\(202x\frac{3}{4}+202x\frac{5}{4}+202x8\)
\(=202x\left(\frac{3}{4}+\frac{5}{4}+8\right)\)
\(=202x\left(\frac{8}{4}+8\right)\)
\(=202x\left(2+8\right)\)
\(=202x10\)
\(=2020\)
\(=202*(\frac{3}{4}+ \frac{5}{4}+8) = 202*9 = 1818\)
=1+(2-3-4+5)+3-4-5+6)+...+(200-201-202+203)+204
=1+0+0+...+0+204
=1+204
=205
tinh
1+2 -3 -4 +5+3-4-5+6 +4-5-6 +7 + ....+200-201 -202 + 203 + 204 =1+0+...+0+204=1+204=205.
bn k cho mik nha. ^-^ thanks bn trc.
S= 2-1-2-3-4-....-201-202
= 2-(1+2+3+4+....+202)
=2- (202:2)( 202+1)
= 2- 101.203
Ta có :
\(202^{303}=\left(202^3\right)^{101}=8242408^{101}\)
\(303^{202}=\left(303^2\right)^{101}=91809^{101}\)
\(\Rightarrow202^{303}>303^{202}\)
202^303=(202^3)^101=8242408^101
303^202=(303^2)^101=91809^101
vì 8242408>91809 nên 8242408^101>91809^101
=>202^303>303^202
=-(202+1)-(201+2)-......-(1+202)
=-203-203-203-......-203
=-20503
\(\frac{201}{202}+\frac{202}{205}\)Và \(201+\frac{202}{202}+205\)
\(=\frac{201}{202}=\frac{201}{202}+\frac{1}{202}=\frac{202}{202}\)
\(\frac{202}{205}=\frac{202}{205}+\frac{3}{205}=\frac{205}{205}\)
\(201+1+205\)
Vậy \(1+1=2\)và \(407\)
=> \(\frac{201}{202}+\frac{202}{205}< 201+\frac{202}{202}+205\)
Ta có: \(\frac{201+202}{202+205}=\frac{201}{202+205}+\frac{202}{202+205}\)
Ta có: 202<202+205 => \(\frac{201}{202}>\frac{201}{202+205}\)(1)
205<202+205 => \(\frac{202}{205}>\frac{202}{202+205}\)(2)
Từ (1) và (2) => \(\frac{201}{202}+\frac{202}{205}>\frac{201+202}{202+205}\)