Các câu hỏi tương tự
Tính :
B = 1 x 3 x 5 - 3 x 5 x 7 + 5 x 7 x 9 - 7 x 9 x 11 + ... + 95 x 97 x 99 - 97 x 99 x 101
Tính nhanh :a) 1 / 1 x 2 + 1/ 2 x 3 + 1/ 3 x 4 + .............................................................................................................. + 1 / 99 x100b) 2 / 1 x 3 + 2 / 3 x 5 + 2 / 5 x 7 + ............................................................................................................ + 2 / 97 x 99c) 4 / 5 x 7 + 4 / 7 x 9 + 4 / 9 x 11 + .......................................................................................................... + 4 / 59 x 61Giúp m...
Đọc tiếp
Tính nhanh :
a) 1 / 1 x 2 + 1/ 2 x 3 + 1/ 3 x 4 + .............................................................................................................. + 1 / 99 x100
b) 2 / 1 x 3 + 2 / 3 x 5 + 2 / 5 x 7 + ............................................................................................................ + 2 / 97 x 99
c) 4 / 5 x 7 + 4 / 7 x 9 + 4 / 9 x 11 + .......................................................................................................... + 4 / 59 x 61
Giúp mình nha mình tick cho.
1.tìm x,y biết
a, x.(y-3)≥0
b, (2.x-1).(y-1)≤0
c,(x-1).(2.k+1)≥0
2. tìm x,y ϵ Z biết
a, x(x+3)=0
b,(x-2).(5-x)=0
c,(x-1).(x^2+1)=0
d, x.y+3.x-7.y=21
e,x.y+3.x-2y=11
1 x 3 x 5 x 7 x 9 x . . . x 99
Đọc tiếp
1 x 3 x 5 x 7 x 9 x . . . x 99
VD
10 tháng 8 2023 lúc 19:23
Tìm x∈Z, biết:
a)x.(x-6)=0
b)(-7-x).(-x+5)=0
c)(x+3).(x-7)=0
d)(x-3).(x2+12)=0
e)(x+1).(2-x) ≥0
f)(x-3).(x-5) ≤0
a)(x-4)*(3x+12)=0
b)3x+1:x+2
c)A=1+3+3^2+3^3+3^4+...+3^99+3^100
a,( x - 29 ) - ( 17 - 38 ) = -9
b, ( x + 5) + ( x - 9 ) = x + 2
c, ( 27 - x ) + ( 15 + x ) = x- 24
d, |2x - 7|- 9 =20
e, x^2 - 2x + 4 = -2x + 7
g, ( x + 1) + (x + 3) + ( x + 5 +...+ ( x + 99) = 0
Bài 1:
a, 5.[7-18;(-3)+3.(2-9)]
b, 5.(-2)3+4.(-3)-23
Bài 2:
a,(2-x)3=9
b,(3x-1)-(x-4)=5
c,(x+1)+(x+2)+(x+5)+...+(x+99)=0
d,- (x+84)+213=-16
a)-26-(x-7)=0
b)24-(30+x)=-7
c)3-(17-x)=-12
d)(5-x)-7=-15