4x 52 + 81:32 - (13-4)2
= 208 + 81:9- 92
= 208 + 9 - 81
= 217 - 81
=136
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tinh nhah
1+5+9+13+17+...+81+85
B=1*2+2*3+3*4+4*5+...+99*100
tinh nhanh
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1) Thuc hien phep tinh:
a) 4^6 × 9^2 / 6^3 × 8^2
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a)2014^100+2014^99 chia het cho 2015
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Help me!! Pleass!!
4*52+81/32-(13-4)2
tính nhanh
A = 1 + 2 + 3 + 4 + ... + 25
B = 2 + 4 + 6 + 8 + ... + 50
C = 1 + 5 + 9 + 13 + ... + 81
13 tháng 4 2023 lúc 20:15
Bài 1: Tính
a) -3/20 + -7/4
b) 6 2/3 - 4 2/3
c) -3/10 + 7/12
d) 35/-9 . 81/7
e) -2/5 - -3/4
f) 5/23 . 7/26 + 5/23 . 9/26
g) -3/12 : 4/15
h) 1 1/6 - 3 1/3
i) -2/5 . (-3) + 3/8 . 4/-10
j) -13/17 + (13/-21 + -4/17)
4x-5 = 16
45 - 2x-1 =29
(2+x)2 = 144
(x-5)2 = 81
(13-x)4 = 81
a)A=1+2+3+4+...+25
b)B=2+4+6+8+...+50
c)C=3+5+7+9+...51
d)D=1+5+9+13+...81