free fire

liên quân

yamatecuraxai

a) 1990.1990 - 1992.1988

= 1990.1990 - (1990 + 2)(1990 - 2)

= 1990.1990 - 1990.1990 + 4 = 4

b) (1374.57 + 687.86) : (870 + 235.122)

= (1374.57 + 687.2.43) : (10.87 + 5.47.2.61)

= (1374.57 + 1374.43) : (10.87 + 10.47.61)

= [1374(57 + 43)] : [10(87 + 47.61)]

= (1374.100) : [10(87 + 47.61)] (đoạn này mẫu số xấu quá, hetcuu)

c) (124.237 + 152) : (870 + 235.122)

= (124.235 + 124.2 + 152) : (870 + 235.122)

= (122.235 + 2.235 + 2.124 + 152) : (870 + 235.122)

= (122.235 + 470 + 248 + 152) : (235.122 + 870)

= (122.235 + 870) : (235.122 + 870) = 1

d) \(\dfrac{423134\cdot846267-423133}{846267\cdot423133+423134}=\dfrac{423133\cdot846267+846267-423133}{846267\cdot423133+423134}\)

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

b.\(\frac{1374.57+1374.34}{26.13+74.13+74}=\frac{1374.91}{1374}=91\)

a, 1990 . 1990 - 1982 . 1998

= ( 1982 + 8 ) . 1990 - 1982 . ( 1990 + 8 )

= 1982 .1990 + 8 .1990 - ( 1982 . 1990 + 8 . 1982 )

= 1982 . 1990 + 8 .1990 - 1982 . 1990 - 8 . 1982

= ( 1982 .1990 - 1982 . 1990 ) + ( 8 . 1990 - 8 . 1982 )

=  8 . ( 1990 - 1982 )

=               8 . 8

=                64

Mình sửa đề bài chút xíu nha 1992 thành 1982 

a)1990.1990+1992.1988

=3960100+3960096

=7920196

b)(124.237+152):(870+235.122)

=(29388+152):(870+28670)

=29540:29540

=1

c)(423134.846267-423133):(846267.423133+423134)

=(423134.846267):(423133-423134)

=(423134.846267):0

=0

mình lam một phần thôi

\(\frac{42134\times846267-423133}{846267\times423133+423134}=\frac{\left(42133+1\right)\times846267-42133}{846267\times423133+423134}\)

\(=\frac{42133\times846267+846267-42133}{846267\times42133+42134}=\frac{846267\times42133+42134}{846267\times42133+42134}=1\)

423134×846267−423133846267×423133+423134 

1990×1990−1992×1998

(1374.57+687.86):(26.13+74.14)

(124.237+152):(870+235.122)

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Giúp mình nha , mk tích cho , mk đang cần gấp