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= ( 1374,57 + 26,13 ) : ( 687,86 + 74,14 )
= 137,67 : 762
= 4589/25400
số đó là
( 78318 + 59082) : ( 338 + 1036)
=137400 : 1374
=100
ai k mình
mình k lại cho
a, 1990 . 1990 - 1992 . 1988
= 3960100 - 3960096
= 4 .
b, ( 1374 . 57 + 687 . 86 ) : ( 26 . 13 + 74 . 14 )
= ( 78318 + 59082 ) : ( 338 + 1036 )
= 137400 : 1374
= 100 .
c, \(\frac{37.13-13}{24 +37.12}\)
\(=\frac{37.\left(12+1\right)-13}{24+37.12}\)
\(=\frac{37.12+37-13}{24+37.12}\)
\(=\frac{37.12+24}{24+37.12}\)
\(=1\)
a. 19991999.1998 - 19981998.1999
=1999.10001.1998 - 1998.10001.1999
=0
b.(1374.57+687.86):(26.13+74.14)
=(687.2.57+687.86):(338+1036)
=\([687.\left(2.57+86\right)]:1374\)
=678.200:1374
=137400:1374
=100
1990.1990-1992.1998=-19916
...............................=100
...............................=1
k mink nha
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)