Toán Lớp 5: Tính nhanh
1998 × 1996 + 1997 × 11 + 1985 / 1997 × 1996 – 1995 × 19%
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Toán Lớp 5: Tính nhanh
1998 × 1996 + 1997 × 11 + 1985 / 1997 × 1996 – 1995 × 19%
Comments ( 2 )
(1998 × 1996 + 1997 × 11 + 1985) / (1997× 1996 – 1995 × 1996 )
= (1998 × 1996 + ( 1996 + 1 ) ×11 + 1985 )/ (1996 × ( 1997 – 1995 )
= (1998 × 1996 + 1996 × 11 + 11 + 1985 )/( 1996× 2)
= (1998 × 1996 + 1996 × 11 + 1996) /( 1996 ×2)
= (1996 × ( 1998 + 11 + 1 ) )/ (1996 ×2)
= 2010 / 2
= 1005
Đây nha em ^^
Giải đáp:1005
Lời giải và giải thích chi tiết:
(1998 × 1996 + 1997 × 11 + 1985) / (1997× 1996 – 1995 × 1996 )
= (1998 × 1996 + ( 1996 + 1 ) ×11 + 1985 )/ (1996 × ( 1997 – 1995 )
= (1998 × 1996 + 1996 × 11 + 11 + 1985 )/( 1996× 2)
= (1998 × 1996 + 1996 × 11 + 1996) /( 1996 ×2)
= (1996 × ( 1998 + 11 + 1 ) )/ (1996 ×2)
= 2010 / 2
= 1005