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+/ \(\frac{16.25+44.100}{29.96+142.48}=\frac{16.25+4.11.100}{29.96+71.2.48}\) +/\(\frac{1996.1995-996}{1000+1996.1994}=\frac{\left(1995+1\right).1995-996}{1000+1996\left(1995-1\right)}\)
\(=\frac{400+400.11}{29.96+71.96}=\frac{400\left(1+11\right)}{96\left(29.71\right)}\) \(=\frac{1995.1995+1995-996}{1000+1996.1995-1996}\)
\(=\frac{400.12}{96.2059}=\frac{50.96}{96.2059}=\frac{50}{2059}\) \(=\frac{1995\left(1995+1\right)-996}{1996.1995-996}=1\)
T i c k cho chị nha ^^ Lát chị làm tiếp cho giờ chị đi ăn cơm đã ^.<
\(\frac{1996.1995-996}{1000+1996.1994}=\frac{\left(1995+1\right).1995-996}{1996\left(1995-1\right)+1000}\)
\(=\frac{1995.1995+1995-996}{1996.1995-1996+1000}\)
\(=\frac{1995\left(1995+1\right)-996}{1995.1996-996}\)
\(=\frac{1995.1996-996}{1995.1996-996}=1\)
a) \(\frac{399\times45+55\times399}{1995\times1996-1991\times1995}=\frac{399\times\left(45+55\right)}{1995\times\left(1996-1991\right)}=\frac{399\times100}{1995\times5}=4\)
b) \(\frac{1996\times1995-996}{1000+1996\times1994}=\frac{1996\times\left(1994+1\right)-996}{1000+1996\times1994}=\frac{1996\times1994+1996-996}{1000+1996\times1994}\)
\(=\frac{1996\times1994+1000}{1000+1996\times1994}=1\)
c) \(\frac{637\times527-189}{526\times637+448}=\frac{637\times\left(526+1\right)-189}{526\times637+448}=\frac{637\times526+637-189}{526\times637+448}=\frac{637\times526+448}{526\times637+448}=1\)
d) \(\frac{677\times874+251}{678\times874-623}=\frac{677\times874+251}{874\times\left(677+1\right)-623}=\frac{677\times874+251}{874\times677+874-623}=\frac{677\times874+251}{874\times677+251}=1\)
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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 !!!
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
câu 1
16 x 25 + 44 x 100
29 x 96 + 124 x 48
16 x 25 +44 x 100
=400 + 4400
=4800
29 x 96 +124 x 48
=2784 + 5952
=8736
Vậy 4800
8736
Câu 1: 6 x 25 + 44 x 100
29 x 96 + 142 x 48
Giải :(6 x 25) + (44 x 100) =
150 + 440 = 590
(29 x 96) + (142 x 48) =
2784 + 6816 = 9600
Câu 2 :1994 x 1993 - 1992 x 1993
1992 x 1993 + 1994 x 7 + 1986
Giải : (1994 x 1993) - (1992 x 1993) =
3 974 042 - 3 970 056 = 3986
(1992 x 1993) + (1994 x 7) + 1986 =
3 970 056 + 13 958 + 1986 = 3 986 000
Câu 3 : 399 x 45 + 55 x 399
1995 x 1996 - 1991 x 1995
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
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c) 637 x 527 - 189=335510 / 526 x 637 + 448=335510
d) 677 x 874 + 251 =591949 / 678 x 874 - 623=591949
học tốt
c, 637x527-189/526x637+448=335918,116
d, 677x874+251/678x874-623=91398,5605
