72+36x2+24x3+18x4+12x6+168
Tính nhanh :
a)\(\frac{72+36x2+24x3+18x4=12x6+168}{2+2+4+6+10+......+68}\)
b)\(\frac{1991x1993-1}{1990+1991x1992}\)
giải chi tiết hộ mình nhé nhớ là tính nhanh
Mình đang cần gấp
A.\(\frac{2004x2005+2006x6-6}{2005x1997+4x2005}\) \(\frac{1999x2000+2001x5-5}{504x2000+500x2000}\)
B.\(\frac{2003x4+1998+2001x2002}{2002+2002x502+500x2002}\) \(\frac{2000x4+1995+2001x1995}{1995x495+1995x5+1995x3}\)
C.\(\frac{72:2x574+286x2x64}{4+4+8+12+20+...+220}\) \(\frac{72+36x2+24x3+18x4+12x6+168}{2+2+4+6+...+512+1024}\)
72+36x2+24x3+18x4+12x6+168 b 1991x1993-1
2+2+4+6+10+.........+68 1990+1991x1992
\(\frac{72+36\times2+24\times3+18\times4+12\times6+168}{2+2+4+6+10+.....+60}\)
\(=\frac{72+72+72+72+72+168}{\left(68-2\right):2+1}\)
\(=\frac{72\times5+168}{\left(68+2\right)\times34\div2}\)
\(=\frac{360+168}{1190}=\frac{528}{1190}=\frac{264}{595}\)
\(b\frac{1991\times1993-1}{1990+1991\times1992}\)
\(=\frac{1991\times\left(1993-1\right)-1}{1990+1991\times1990}\)
\(=\frac{1991\times1992-1}{1990+1991\times1992}\)
\(=\frac{1990}{1990}=1\)
tính: 72-36x2+48-8
a/(-168)+72.(-168)+(-168).27
(-168)+72.(-168)+(-168).27=(-168).1+(-168).72+(-168).27=(-168).(1+72+27)=(-168).100=(-16800)
a/ (-168)+ 72.(-168)+(-168).27
(-168)+72.(-168)+(-168).27
=-168.(1+72+27)
=-168.100
=-16800
(-168)+72.(-168)+(-168).27
=(-168).(72+27+1)
=(-168).100
=-16800
a, ( - 168 ) + 72.( - 168 ) + ( - 168 ).27
= ( -168 ) . ( 1 + 72 + 27 )
= ( - 168 ) . 100
= - 16800
(-168)+72.(-168)+(-168).27
(-168) + 72.(-168) + (-168).27
= (-168).(1+72+27)
= (-168).100
= -16800
(-168)+72.(-168)+(-168).27
\((-168)+72.(-168)+(-168).27 =(-168).1+72.(-168)+(-168).27 =(-168).(1+72+27) =(-168).100 = -16800\)
(-168)+72.(-168)+(-168).27=(-168).1+(-168).72+(-168).27=(-168).(1+72+27)=(-168).100=(-16800)
(-168)+(-72).168+(-168).27
-168+(-72).168+(-168).27
=-168.1+(-72).168+(-168).27
=-168.1+72.(-168)+(-168).27
=-168(1+72+27)
=-168.100
=-16800
li-ke nha!!!~♥
= -168+72. (-168)+(-168).27
=-168 .(72+27+1)
=-168 . 100
=-16800