Tính nhanh:
\(\dfrac{1988\times1996+1997+1985}{1997\times1996-1995\times1996}\)
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\(A=\frac{1998.1996+1997.11+1985}{1997.1996-1995.1996}\)
\(A=\frac{1998.1996+\left(1996+1\right).11+1985}{1996.\left(1997-1995\right)}\)
\(A=\frac{1998.1996+1996.11+11+1985}{1996.2}\)
\(A=\frac{1998.1996+1996.11+1996}{1996.2}\)
\(A=\frac{1996.\left(1998+1+1\right)}{1996.2}\)
\(A=\frac{1996.2000}{1996.2}=1000\)
\(\frac{1998\times1996+1996\times11+1996}{1996\times2}\)\(=\frac{2010\times1996}{2\times1996}=1005\)
k nha
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\(\frac{1998\times1996+1997+1995}{1996\times\left(1997-1995\right)}=\frac{1998\times1996+1996+1996}{1996\times2}=\frac{1996\times1999+1996}{1996\times2}\)
=\(\frac{1996\times2000}{1996.2}=\frac{2000}{2}=1000\)
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1988 x 1996 + 1997 x 11 + 1985
= 1988 x1996 + 1996 x 22 + 1985
= 1996 x ( 1988 + 22 ) + 1985
= 1996 x 2000 + 1985
= 3992000 + 1985
= 3993985
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\(=\left(45\cdot128-45\cdot128\right)\cdot\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
=0*A
=0
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\(\dfrac{1988\:×\:1996\:+\:1997\:+\:1985}{1997\:×\:1996\:-\:1995\:×\:1996}\) (rút bỏ các phần tử, mẫu giống nhau)
= \(\dfrac{1988\:+\:1985}{1995\:×\:1996}\)
= (còn lại tự tính)