\(=\frac{\left(423133+1\right).846267-423133}{846267.423133+423134}=\frac{846267.423133+846267-423133}{846267.423133+423134}=\)

\(=\frac{846267.423133+423134}{846267.423133+423134}=1\)

a)1990*1990-1992*1988=1990*(1988+2)-(1990+2)*1988=1990*1988+2*1990-1990*1988-2*1988=(1990*1988-1990*1988)+(2*1990-2*1988)=0+2*(1990-1988)=2*2=4

b)(1374*57+687*86)/(26*13+74*14)=(687*2*57+687*86)/(26*13+74+74*13)=(687*114+687*86)/(100*13+74)

=(687*200)/1374=137400/1374=100

c)(124*237+152)/(870+235*122)=\(\frac{\left(122+2\right)\cdot237+152}{870+\left(237-2\right)\cdot122}=\frac{122\cdot237+2\cdot237+152}{870-2\cdot122+237\cdot122}=\frac{122\cdot237+626}{626+237\cdot122}=1\)

d)\(\frac{423134\cdot846267-423133}{846267\cdot423133+423134}=\frac{\left(423133+1\right)\cdot846267-423133}{846267\cdot423133+423134}\)

\(=\frac{423133\cdot846267+846267-423133}{846267\cdot423133+423134}=\frac{423133\cdot846267+423134}{846267\cdot423133+423134}=1\)

(mỏi hết cả mắt)

\(\frac{423134.846267-423133}{846267.423133+423134}=\frac{\left(423134+1\right).846267-423133}{846267.423133+423134}\)

\(\frac{423133.846267+846267-423133}{846267.423133-423134}=\frac{423133.846267-423134}{864267.423133-423134}=1\)

\(\dfrac{423134.846267-423133}{846267.423133+423134}\)

\(=\dfrac{423134.846267-423133}{846267.\left(423134-1\right)+423134}\)

\(=\dfrac{423134.846267-423133}{846267.423134-846267+423134}\)

\(=\dfrac{423134.846267-423133}{846267.423134-423133}\)

\(=1\)

Chúc bạn học tốt!!!!

 kết quả là = 1 

kết quả = 0

\(\frac{423134\cdot846267-423133}{846267\cdot423133+423134}=0\)

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