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DT
6
18 tháng 7 2019
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
18 tháng 7 2019
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
TM
18 tháng 7 2019
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18 tháng 7 2019
c) 637 x 527 - 189=335510 / 526 x 637 + 448=335510
d) 677 x 874 + 251 =591949 / 678 x 874 - 623=591949
học tốt
18 tháng 7 2019
c, 637x527-189/526x637+448=335918,116
d, 677x874+251/678x874-623=91398,5605
TM
18 tháng 7 2019
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31 tháng 8 2017
623+x=1019
x=1019-623
x=396
413+(x+9)=1994
(x+9)=1994-413
x+9=1581
x=1581-9
x=1572
519+(73-x)=563
72-x =563 - 519
72- x=44
x=72-44
x=28