125125/370370+245/370=
125125/370370+245/370=
\(\frac{1993.1995-1}{1993.1994+1992}\)
\(=\frac{1993.1994+1993-1}{1993.1994+1992}\)
\(=\frac{1993.1994+1992}{1993.1994+1992}\)
\(=1\)
Mấy bài dạng thế này bạn chỉ cần phân tích ra thôi
1993.1995-1/1993.1994+1992
= 1993.1994+1993-1/1993.1994+1992
= 1993.1994+(1993-1)/1993.1994+1992
= 1993.1994+1992/1993.1994+1992
= 1
Ủng hộ mk nha ♡_♡, bài mk đúng 100% lun
1993.1995-1=3976035-1
=3976034
1993.1994+1992=3974024+1992
=1976034
Đặt tính rồi tính:
162 + 370
728 – 245
( 1+ 3+ 5 + ... + 2005 ) * ( 125125*127- 127127 * 125 )
Ta có:
(1+3+5+...+2005)x(125125x127-127127x125)
=(1+3+5+...+2005)x(125x1001x127-127x1001x125)
=(1+3+5+...+2005)x0
=0
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
a+b=10
a+c=25
b+c=18
20/84 - 4/125 + 3737/ 2121 - 121121/125125
20/84 - 4/125 + 3737/2121 - 121121/125125
\(\frac{20}{84}-\frac{4}{125}+\frac{3737}{2121}-\frac{121121}{125125}=\frac{5}{21}+\frac{37}{21}-\frac{4}{125}-\frac{121}{125}=2-1=1\)
42/44 + 250/286 + -2121/2323 + -125125/143143
\(\frac{42}{44}+\frac{250}{286}+\frac{-2121}{2323}+\frac{-125125}{143143}\)
\(=\frac{21}{22}+\frac{125}{143}+\frac{-21}{23}+\frac{-125}{143}\)
\(=\left(\frac{21}{22}+\frac{-21}{23}\right)+\left(\frac{125}{143}+\frac{-125}{143}\right)\)
\(=\frac{483}{506}+\frac{-462}{506}+0\)
\(=\frac{21}{506}\)
Cbht
Trả lời
42/44+250/286+(-2121/2323)+(-125125/143143)
=21/22+125/143+(-21/23)+(-125/143)
=21/22+(-21/23)+125/143+(-125/143)
=21/22+(-21/23)+0
=483+(-462)/506
=21/506
Ko chắc, bạn kiểm tra giúp mk nha !
( 1+ 3 + 5 + ...+ 2005) * ( 125125 * 127 - 127127*125)
( 1 + 3 + 5 +.....+ 2005) * ( 125125 * 127 - 127127 * 125 )
= ( 1+3+5+....+2005) * ( 125 * 1001 * 127 - 127 * 1001 * 125)
= (1 +3+5+....+2005) * 0
= 0
k cho mình nha bạn...!
Ta có:(1+3+5+...+2005)x(125125x127-127127x125)
=(1+3+5+...+2005)x(125x1001x127-127x1001x125)
=(1+3+5+...+2005)x0
=0
( 1 + 3 + 5 + ...+ 2005 ) . ( 125125 . 127 - 127127 . 125 )
= ( 1 + 3 + 5 + ... + 2005 ) . ( 125 . 1001 x 127 - 127 x 1001 x 125 )
= ( 1 + 3 + 5 + .. + 2005 ) . 0
= 0
so sánh
123/124 và 124124/125125
Ta có 124124/125125 = 124/125
1 - 123/124 = 1/124 ; 1 - 124/125 = 1/125
Vì 1/124 > 1/125 nên 124124/125125 > 123/124
So sanh cac phan so sau 123/124 va 123123/124124
( 1+3+5+7+......+65+67) x (125x1001 -125125) +10
\(\left(1+3+5+7+...+65+67\right)\cdot\left(125\cdot1001-125125\right)+10\)
\(=\left(1+3+5+...+65+67\right)\cdot\left(125\cdot1000+125-125125\right)+10\)
\(=\left(1+3+5+...+65+67\right)\cdot\left(125000+125-125125\right)+10\)
\(=\left(1+3+5+...+65+67\right)\cdot\left(125125-125125\right)+10\)
\(=\left(1+3+5+...+65+67\right)\cdot0+10\)
\(=0+10\)
\(=10\)
Hơi dài dòng nhưng đầy đủ