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DV
5
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
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
NB
1
TM
18 tháng 7 2019
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TQ
3
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
DT
5
TM
18 tháng 7 2019
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DT
9 tháng 5 2017
\(\frac{637\cdot526+637-189}{526\cdot637+448}\)=\(\frac{637\cdot526+448}{637\cdot526+448}\)=1
11 tháng 8 2021
a) 399 x 45 + 55 x 399
= 399 x (45 + 55)
= 399 x 100
= 39900
1995 x 1996 - 996
= 3982020 - 996
= 3981024
b) 1996 x 1995 - 996
= 3982020 - 996
= 3981024
1000 + 1996 x 1994
= 1000 + 3980024
= 3981024
c) 637 x 527 - 189
= 335699 - 189
= 335510
526 x 637 + 448
= 335062 + 448
= 335510
Lần sau dùng máy tính mà tính nhá !!!
AT
11 tháng 8 2021
a) 399 x 45 + 55 x 399 = 399 x (45 + 55) = 399 x 100 = 39900 1995 x 1996 - 996 = 3982020 - 996 = 3981024 b) 1996 x 1995 - 996 = 3982020 - 996 = 3981024 1000 + 1996 x 1994 = 1000 + 3980024 = 3981024 c) 637 x 527 - 189 = 335699 - 189 = 335510 526 x 637 + 448 = 335062 + 448 = 335510
X - 637 = 125 x 6
X= X - 637 = 750
X= 750 + 637
X= 1387
X + 174 = 3168 : 9
X= X + 174 = 352
X= 352 - 174
X = 178
x - 637 = 750
x = 750 + 637
x = 1387
x + 174 = 352
x = 352 - 174
x = 178