a) A=625–(61–17).12+(27+27):17A=625–(61–17).12+(27+27):17
=625–528+3=100=625–528+3=100
b) B=−126–(42–5)2+870:29B=−126–(42–5)2+870:29
=−126–112+30=−126–112+30
=−126–121+30=−217
Tính hợp lý:
625- (61-17).12+ (27+24)
\(A=6.25-\left(61-17\right).12+\left(27+24\right):17\)
\(B=\left(-126\right)-\left(4^2-5^2\right)+870:29\)
\(7^2.5-\left(2x+1\right)=630:9\)\(\)
\(\left(12-4x\right)+120:23=17\)
1,tính: a,A=625-(61-17).12+(27+24):17 b,B=-126-(42-5)2+270:29 2.Tính:\((-5)+\left(\pm2\right)+|-3|+|+2|\)
Tìm x :
a) [ ( x + 32 ) - 17 ] * 2 = 42
b) [ 61 + ( 53 - x ) ] * 17 = 1785
c) 697 : 15x + 364 / x = 17
d) 92 * 4 - 27 = x + 350 / x + 315
2x + x - 12 = 0
64 . 6 + 81 . 4 + 17 . 6
43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
1, 1-5+9-13+...+145-149
2, 19-23+27-31+...+203-207
3, 12-17+22-27+....+502-507
4, 3-8+13-18+....+213-218
5, 1-2-3+4+5-6-7+8+9-10-11+12+....+61-62-63+64
6, 3-7-11+15+19-23-27+31+....+339-343-347+351
Giup đỡ mình nhé! Giải nhanh giùm nhé!
tim x biet
a)50<2^n<100
b)50<7^n<2500
2)a)3^n=27:5^n=625:12^n=144
b)2^n=16=128:3^n:9=27
c)(2^n+1)^3=27
Thực hiện phép tính
a) 5.(–8).( –2).(–3) b) 4.(–5)2 + 2.(–5) – 20
c) 27.(15 –12) – 15.(27 –12) d) - 126 – (42 – 5)2 + 870 : 29
Thực hiện phép tính:
[ 5082 / ( 1729 * 1727 _ 1627 / 1727 _ 162 ) + 13 * 12 ] /31 + 92
