59+11+30=???
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Sửa đề: \(2x+\dfrac{11}{6}+\dfrac{23}{12}+\dfrac{39}{20}+\dfrac{59}{30}+\dfrac{83}{42}+\dfrac{111}{56}=12\)
\(\Leftrightarrow2x+\left(2+2+2+2+2+2\right)-\left(\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}+\dfrac{1}{56}\right)=12\)
\(\Leftrightarrow2x-\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{7}-\dfrac{1}{8}\right)=0\)
\(\Leftrightarrow2x-\dfrac{3}{8}=0\)
hay x=3/16
a) \(A=1-\dfrac{2002}{2003}\)
\(A=\dfrac{1}{2003}\)
b) \(B=\dfrac{179}{30}-\left(\dfrac{59}{30}-\dfrac{3}{5}\right)\)
\(B=\left(\dfrac{179}{30}-\dfrac{59}{30}\right)-\dfrac{3}{5}\)
\(B=\dfrac{120}{30}-\dfrac{3}{5}\)
\(B=4-\dfrac{3}{5}\)
\(B=\dfrac{17}{5}\)
c) \(C=\left(\dfrac{46}{5}-\dfrac{1}{11}\right).11\)
\(C=\dfrac{501}{55}.11\)
\(C=\dfrac{501}{5}\)
a) \(A=1-\dfrac{2002}{2003}=\dfrac{2003}{2003}-\dfrac{2002}{2003}=\dfrac{1}{2003}\)
b) \(B=\dfrac{179}{30}-\left(\dfrac{59}{30}-\dfrac{3}{5}\right)=\dfrac{179}{30}-\dfrac{59}{30}+\dfrac{3}{5}=4+\dfrac{3}{5}=\dfrac{23}{5}\)
c) \(C=\left(\dfrac{46}{5}-\dfrac{1}{11}\right)\cdot11=\dfrac{46}{5}\cdot11-\dfrac{1}{11}\cdot11=\dfrac{506}{5}-1=\dfrac{501}{5}\)
a)15/16:3/8x3/4
=15/16:6/16x12/16
=15/16x16/6x12/16
=15/6x12/16
=30/16=15/8
b)5/11x18/29-5/11x8/29+5/11x19/29
=5/11x(18/29-8/29+19/29)
=5/11x1=5/11
a) x2−y2−2y−1x2−y2−2y−1 tại x=93x=93 và y=6y=6
Ta có : x2−y2−2y−1=x2−(y2+2y+1)x2−y2−2y−1=x2−(y2+2y+1)
=x2−(y+1)2=x2−(y+1)2
=(x−y−1)(x+y+1)=(x−y−1)(x+y+1)
Khi x=93x=93 và y=6y=6 , ta có :
(93−6−1)(93+6+1)(93−6−1)(93+6+1) =86.100=86.100
=8600
(85/11 + 244/59) - (185/59 - 58/11)
= (85/11 + 58/11) - (244/59 - 185/59)
= 143/11 - 1
= 143/11 - 11/11
= 131/11
(59-5^30)-(59+3^3-5^30)
=[(59-5^30)-(59-5^30)]+3^3
=0+9
=9
= 59 - 530 -59 - 33 + 530
= 59-59 -530+ 530 - 33
= 0+ 0 - 33
= -33 = -27
chắc chắn 100% lun
tk mình nha
học giỏi nha
cảm ưn nhìu
\(\left(59-5^{30}\right)-\left(59+3^3-5^{30}\right)\)
\(=59-5^{30}-59-3^3+5^{30}\)
\(=3^3\)
\(=27\)
(59-530)-(59+33-530)
= 59 - 5 30 - 59 - 33+530
= (59-59) + ( 530- 530) - 33
= 0 + 0 -27
= -27
59+11+30
=70+30
=100
=100 nha