\(\frac{637.527-189}{526.637+448}\)= ?
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(637.527-189):(526.637+448)
= \(\frac{637.527-189}{526.637+448}\)
= \(\frac{637.\left(526+1\right)-189}{526.637+448}\)
= \(\frac{637.526+637-189}{526.637+448}\)
= \(\frac{637.526+448}{526.637+448}\)
= \(1\)
**** cho minn nhe
637.527-189 =637.526+637.1-189 =637.526+448 =1
526.637+448 637.526+448 637.526+448
Ta có:
\(\dfrac{637.527-189}{526.637+448}=\dfrac{637.\left(526+1\right)-189}{526.637+448}=\dfrac{637.526+637-189}{526.637+448}=\dfrac{637.526+448}{526.637+448}=1\)
\(a)\)\(\left(1989.1990+3978\right)\div\left(1992.1991-3984\right)\)
\(=\)\(\left(1989.1990+1989.2\right)\div\left(1992.1991-1992.2\right)\)
\(=\)\(\left[1989.\left(1990+2\right)\right]\div\left[1992.\left(1991-2\right)\right]\)
\(=\)\(\left(1989.1991\right)\div\left(1992.1989\right)\)
\(=\)\(1\)
\(b)\)\(\left(637.527-189\right)\div\left(526.637+448\right)\)
\(=\)\(\left[637.\left(526-1\right)-189\right]\div\left(526.637-448\right)\)
\(=\)\(\left[637.526+\left(637-198\right)\right]\div\left(637.526-448\right)\)
\(=\)\(\left(636.526+448\right)\div\left(637.526-448\right)\)
\(=\)\(1\)
\(=\dfrac{637.\left(526+1\right)-189}{526.637+448}=\dfrac{637.526+637-189}{526.637+446}=\dfrac{637.526+448}{526.637+448}=1\)
\(\left(637.527-189\right):\left(526.637+448\right)\)
\(=\left(335699-189\right):\left(335062+448\right)\)
\(=335510:335510\)
\(=1\)
\(\frac{637.527-189}{526.637+448}=\frac{637.\left(526+1\right)-189}{526.637+448}=\frac{637.526+637-189}{526.637+448}=\frac{637.526+448}{526.637+448}=1\)
a)=\(\frac{637x\left(526+1\right)-189}{526x637+448}\)
=\(\frac{637x526+637-189}{526x637+448}\)
=\(\frac{637x526+448}{526x637+448}\)
=\(1\)(vì tử số =mẫu số)
b)=\(\frac{\left(134+1\right)x269-133}{134x269+136}\)
=\(\frac{134x269+269-133}{134x269+136}\)
=\(\frac{134x269+136}{134x269+136}\)
=1(vì tử số =mẫu số)
\(b=\frac{637.527-189}{526.637+448}\)
\(b=\frac{637.\left(526+1\right)-189}{526.637+448}\)
\(b=\frac{637.526+\left(637-189\right)}{526.637+448}\)
\(b=\frac{637.526+448}{526.637+448}=1\)
Dấu . là nhân nha
\(\frac{637.527-189}{526.637+448}=1\)