123 345 x 5 = ...
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a) \(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{6}{12}=\frac{1}{2}\)
b) \(=-\frac{49}{25}-\frac{5}{36}+\frac{4}{123}+\frac{49}{25}-\frac{4}{123}-\frac{1}{36}\)
\(=\left(-\frac{49}{25}+\frac{49}{25}\right)+\left(\frac{4}{123}-\frac{4}{123}\right)-\left(\frac{5}{36}+\frac{1}{36}\right)\)
\(=-\frac{6}{36}=-\frac{1}{6}\)
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123 - 5 x 9
= 123 - 45
= 78
1257 x 2 - 345
= 2514 - 345
= 2169
99 x 9 + 357
=891 + 357
= 1248
4793 x 3 + 8
= 14379 + 8
= 14387
594 - 3 x 7
=594 - 21
= 537
555 - 177 x 2
= 555 - 354
= 201
345 : 3 + 9
= 115 + 9
=124
(345 + 555) x 3
= 900 x 3
= 2700
k cho mk nha Trần Đại Thành Danh
123-5*9=123-45=78
1257*2-345=2514-345=2169
99*9+357=891+357=1248
4793*3+8=14379+8=14387
594-3*7=594-21=573
555-177*2=555-254=201
345:3+9=115+9=124
(345+555)*3=900*3=2700
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=123 x ( 345 + 354 + 567 + 576 +1 )
=123 x 1843
= 226689
k nha
123 x 345 + 123 x 354 + 123 x 567 + 123 x 576 + 123
=123x(345+354+567+576+1)
=123x1843
=226689
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a) x – 123 = 345 b) x + 254 = 665
x = 345 + 123 x = 665 – 254
x = 468 x = 211
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= 616725
123345 x 5 = 616725
HT