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1724 * 85 +1724 * 25 - 1724 * 10
= 1724 * ( 85+25-10)
= 1724 * 90
= 155160
a)
13 x 81 + 13 x 19
= 13 x ( 81 + 19 )
= 13 x 100 = 1300
b)
246 x 83 + 246 x 17
= 246 x ( 83 + 17 )
= 246 x 100
= 24600
c)
246 x 83 + 247 x 17
= 246 x 83 + 246 x 17 + 17
= 246 x ( 83 + 17 ) + 17
= 246 x 100 + 17
= 24600 + 17
= 24617
Ủng hộ mik nhak !!!
13x81+13x19
=13x(19+81)
=13x100
=1300
246x83+246x17
=246x(83+17)
=246x100
=24600
Ta có:(1+2+3+4+5+...+97+98+99)x100/2x50:2500
=[(99+1)x99:2)]x50x50:2500
=4950x2500:2500
=4950x1
=4950
a)
`127+246+273+354`
`=(127+273)+(246+354)`
`=400+600`
`=1000`
b)
`1,58+3,04+6,96+3,42`
`=(1,58+3,42)+(3,04+6,96)`
`=5+10`
`=15`
c)
`1/2+1/3+1/5+1/6`
`=(1/2+1/3+1/6)+1/5`
`=(3/6+2/6+1/6)+1/5`
`=6/6+1/5`
`=1+1/5`
`=5/5+1/5`
`=6/5`
a, 127 + 246 + 273 + 354
= ( 127 + 273) + ( 246 + 354)
= 400 + 600
= 1000
b, 1,58 + 3,04 + 6,96 + 3,42
= ( 1,58 + 3,42) + ( 3,04 + 6,96)
= 5 + 10
= 15
c, \(\dfrac{1}{2}\) + \(\dfrac{1}{3}\) + \(\dfrac{1}{5}\) + \(\dfrac{1}{6}\)
= ( \(\dfrac{1}{2}\) + \(\dfrac{1}{3}\) + \(\dfrac{1}{6}\)) + 0,2
= 1 + 0,2
= 1,2
\(A=\frac{1+\left(1+2\right)+\left(1+2+3\right)+...+\left(1+2+...+98\right)}{1.98+2.97+3.96+...+97.2+98.1}\)
\(A=\frac{1.98+2.97+3.96+...+98.1}{1.98+2.97+3.96+...+98.1}=1\)
(-98).(1-246)-246.98=(-98).1-(-98).246-246.98=(-98)-[(98)+98].246=(-98)-0.246=(-98)-0=-98
k cho mình nhé
(-98).(1-246)-246,98
=(-98).1-(98).246-246,98
=(98)-(98)+(98).246
=(-98)-0,246
=(-98)-0=-98
nhớ k cho mik nhà đi mà ^^