511 + 2542 =3053

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511+2542=3053

511+2542=3053

\(\left(\frac{2}{31\times33}+\frac{2}{33\times35}+...+\frac{2}{39\times41}\right)\times2542-2,04:x=19\)

\(\Rightarrow\left(\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{35}+...+\frac{1}{39}-\frac{1}{41}\right)\times2542-2,04:x=19\)

\(\Rightarrow\left(\frac{1}{31}-\frac{1}{41}\right)\times2542-2,04:x=19\)

\(\Rightarrow\frac{10}{1271}\times2542-2,04:x=19\)

\(\Rightarrow20-2,04:x=19\)

\(\Rightarrow2,04:x=20-19\)

\(\Rightarrow2,04:x=1\)

\(\Rightarrow x=2,04:1\)

\(\Rightarrow x=2,04\)

Vậy x = 2,04

\(\left(\frac{2}{31\text{ x }33}+\frac{2}{33\text{ x }35}+...+\frac{2}{39\text{ x }41}\right)\text{ x }2542-2,04\text{ : }x=19\)

\(\left(\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{35}+...+\frac{1}{39}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=1\)

\(\left(\frac{1}{31}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=1\)

\(\frac{10}{1271}\text{ x }2542-2,04\text{ : }x=1\)

\(20-2,04\text{ : }x=1\)

\(2,04\text{ : }x=20-1\)

\(2,04\text{ : }x=19\)

\(x=2,04\text{ : }19\)

\(x=\frac{51}{475}\)

\(\left(\frac{2}{31\text{ x }33}+\frac{2}{33\text{ x }35}+...+\frac{2}{39\text{ x }41}\right)\text{ x }2542-2,04\text{ : }x=19\)

\(\left(\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{35}+...+\frac{1}{39}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=19\)

\(\left(\frac{1}{31}-\frac{1}{41}\right)\text{ x }2542-2,04\text{ : }x=19\)

\(\frac{10}{1271}\text{ x }2542-2,04\text{ : }x=19\)

\(20-2,04\text{ : }x=19\)

\(2,04\text{ : }x=20-19\)

\(2,04\text{ : }x=1\)

\(x=2,04\text{ : }1\)

\(x=2,04\)

Ta có:

425*27+425*72+425=425*(27+72+1)=425*100=42500

425x27+425x72+425

=425x27+425x72+425x1

=425x(27+72+1)

=425x100

=42500

425 x 27 + 425 x 72 + 425

= 425 x (27 + 72 + 1)

= 425 x 100

= 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

425:100=4,25

425:0,01=42500

250 : 0,1 =2500

250 : 10 = 25 

425 : 0,01 = 42500

425 : 100 = 4,25.

+, 250:0,1=2500

+, 425:0,01=42500

+, 250:10=25

+, 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

(-325). (425-27) - 425. (27-325) = -2700

Chỉ cách làm cho mk ik

\(\left(-325\right).\left(425-27\right)-425.\left(27-325\right)\)

\(=\text{ }\left[\left(-325\right).425-\left(-325\right).27\right]-\left(425.27-425.325\right)\)

\(=\left(-325\right).425-\left(-325\right).27-425.27+425.325\)

\(=\text{ }\left[\left(-325\right).425+425.325\right]-\text{ }\left[\left(-325\right).27+425.27\right]\)

\(=\text{ }\left\{425.\text{ }\left[\left(-325\right)+325\right]\right\}-\text{ }\left\{27.\text{ }\left[\left(-325+425\right)\right]\right\}\)

\(=\left(425.0\right)-\left(27.100\right)\)

\(=0-2700\)

\(=-2700\)