\(3^4.5^2+112-2^4.7-5^2=81.25+112-16.7-25=2025+112-112-25=2000\)
34x52+112-24x7-52
81x25+112-16x7-25
2025+112-112-25
2000
Tính
A = 3x4+4x5+5x6+6x7+.....+79x80
B = 1x2x3+3x4x5+5x6x7+.....+98x99x100
C = 1x4+2x5+3x6+4x7+.....+97x100
1/2+2/2x4+3/4x7+4/7x11+5/11x16
Giải rõ ra nhé!Mik đag cực kì gấp
a)4x5 mũ 2 -81 : 3 mũ 2
b) 2 mũ 4 x 5 - [ 131 - ( 13 -4) mũ 2]
c) 3 mũ 3 x 22 x 3 mũ 3 x 19
d)100 : {250:[450-4x5 mũ 3 - 2 mũ 2 x 25]}
A=3^2/1x4+3^2/4x7+3^2/7x10+...+3^2/97x100
80:2^3+3^2-2x5^2:5
2^3x3:{390:[4x5^3-5x(25+7^2)]}
a, 160- (2/3. 5/2- 6x25)
b, 4x5/2-32:2/4
c, 5871 :[ 928-(247-82)x5]
d, 777:7+1331:11/3
4x5^100 x ( 1/5 + 1/5^2 + 1/5^3 + ...... + 1/5^99 + 1/5^100 ) + 1 Các bạn giúp mình với!!!
32/1x2+52/2x3+72/3x4+92/4x5+112/5x6+........+992/49x50. tính nhanh
