72+36x2+24x3+18x4+12x6+168 b 1991x1993-1
2+2+4+6+10+.........+68 1990+1991x1992
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
72+36x2+24x3+18x4+12x6+168
72 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168
= 72 + 72 + 72 + 72 + 72 + 168
= ( 72 x 5 ) + 168
= 360 + 168
= 528
chúc bạn học tốt
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 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168 / 2 + 2 + 4 + 6 + 10 + ...+ 68
\(\frac{72+36\times2+24\times3+18\times4+12\times2+168}{2+2+4+6+10+..................+68}\)
Tinh nhanh:
\(\frac{\text{72+36*2+24*3+18*4+12*6+168}}{\text{2+2+4+6+10+16+26+42+68}}\)
Giúp tớ bài này với
1. Tính nhanh
P = \(\frac{1991x1992-1}{1990+1991x1992}\)
72+36*2+24*3+18*4+12*6+168
72+36*2+24*3+18*4+12*6+168
=72+72+72+72+72+168
=72*5+168
=360+168
=528
72+72+72+72+72+168=72*5+168=360+168=528
72 + 36 * 2 + 24 * 3 + 18 * 4 + 12 + 6 + 168
72 + 36 * 2 + 24 * 3 + 18 * 4 + 12 + 6 + 168
= 72 + 72 + 72 + 72 + 12 + 6 + 168
= 72 * 4 + 12 + 6 + 168
= 288 + 12 + 6 + 168
= 474
Chúc bạn học tốt! ^_^
72+36x2+24x3+18x4+12+6+168
=72+72+72+72+12+6+168
=474
72+36×2+24×3+18×4+12+6+168
=72+72+72+72+12+6+168
=474