111+1+156+4+74+78+678+874+698+47+8478=
Những câu hỏi liên quan
a) 56 - 131 – 156 + 331 Bài 2. Thực hiện phép tính (tính hợp lí nếu có thể)
b) - (78 - 566) + (- 666 + 111) - 22
c) 12 . (- 47) + 12 . (- 19) + (- 66) . 88
d) [157 - (13 - 4)2 ]:4 - 3 15:312
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A = 677 x 874 + 251 / 678 x 874 - 623
Tính :
(677*874+251) : (678*874-623)=1
Mình không biết đúng hay sai nữa.Thông cảm
Tính nhanh:
677 x 874 + 251
678 x 874 - 623
\(\frac{677\times874+251}{678\times874-623}\)\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)\(=\frac{677\times874+251}{677\times874+1\times874-623}\)\(=\frac{677\times874+251}{677\times874+874-623}=\frac{677\times874+251}{677\times874+251}=1\)
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\(\frac{677.874+251}{678.874-623}\)
\(=\frac{677.874+251}{\left(677+1\right).874-623}\)
\(=\frac{677.874+251}{677.874-1.874-623}\)
\(=\frac{677.874+251}{677.874+874-623}\)
\(=\frac{677.874+251}{677.874+251}\)
\(=1\)
Hok tốt
1/ 94:x= 47/ 105.
X=....?
2/ 74/111=a/87.
a=...?
637*527-189/678*874-623
A, 1996*1995-996/678*874-623
B, 2005 * 2007 - 1 / 2004 + 2005 * 2006
677nhan 875+163 phan 678 nhan 874 -34
677 x 875 + 163/678 x 874 - 34
= 592375 + 71231/339 - 34
= 592585,1209 - 34
= 592551,1209
nhớ T I C K cho mình nha
677x875-163/678x874-34
=592375+71231/339-34
=592585,1209-34
=592551,1209
HỌC TỐT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
tính nhanh :
c) 637 x 527 - 189 / 526 x 637 + 448
d) 677 x 874 + 251 / 678 x 874 - 623
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
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\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
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\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{526\times637+637-189}{526\times637+448}=\frac{526\times637+448}{526\times637+448}=1\)
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tính nhanh :
c) 637 x 527 - 189 / 526 x 637 + 448
d) 677 x 874 + 251 / 678 x 874 - 623
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