414242+425+2542
=
=
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\(\left(\frac{2}{31\times33}+\frac{2}{33\times35}+...+\frac{2}{39\times41}\right)\times2542-2,04:x=19\)
\(\Rightarrow\left(\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{35}+...+\frac{1}{39}-\frac{1}{41}\right)\times2542-2,04:x=19\)
\(\Rightarrow\left(\frac{1}{31}-\frac{1}{41}\right)\times2542-2,04:x=19\)
\(\Rightarrow\frac{10}{1271}\times2542-2,04:x=19\)
\(\Rightarrow20-2,04:x=19\)
\(\Rightarrow2,04:x=20-19\)
\(\Rightarrow2,04:x=1\)
\(\Rightarrow x=2,04:1\)
\(\Rightarrow x=2,04\)
Vậy x = 2,04
\(\left(\frac{2}{31\text{ x }33}+\frac{2}{33\text{ x }35}+...+\frac{2}{39\text{ x }41}\right)\text{ x }2542-2,04\text{ : }x=19\)
\(\left(\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{35}+...+\frac{1}{39}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=1\)
\(\left(\frac{1}{31}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=1\)
\(\frac{10}{1271}\text{ x }2542-2,04\text{ : }x=1\)
\(20-2,04\text{ : }x=1\)
\(2,04\text{ : }x=20-1\)
\(2,04\text{ : }x=19\)
\(x=2,04\text{ : }19\)
\(x=\frac{51}{475}\)
425x27+425x72+425
=425x27+425x72+425x1
=425x(27+72+1)
=425x100
=42500
425 x 32 + 69 x 425 - 425
= 425 x 32 + 69 x 425 - 425 x 1
= 425 x (32+69-1)
= 425 x 100
= 42500
250 : 0,1 =2500
250 : 10 = 25
425 : 0,01 = 42500
425 : 100 = 4,25.
425 x 5847 - 125 + 1435 x 425
= 425 x ( 5847 + 1435) - 125
= 425 x 1982 - 125
= 842 225
425 x 5847 - 125 + 1435 x 425
= 425 x ( 5847 + 1435) - 125
= 425 x 1982 - 125
= 842 225
Số bị chia | 425 | 425 | 727 | 727 |
Số chia | 6 | 7 | 8 | 9 |
Thương | 70 | 60 | 90 | 80 |
Dư | 5 | 5 | 7 | 7 |
417209
414242+425+2542
=414667+2542
=417209