8x2x1/8x1/4x1/2x4
1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7+1/7x1/8+1/8x1/9
1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7+1/7x1/8+1/8x1/9
=7/18
Tính nhanh 3/4x1/2x4/5x2/3:1/5=
3/4 x 1/2 x 4/5 x 2/3 : 1/5
=1/2 x 2/3 x 3/4 x4/5 : 1/5
=1 x 2 x 3 x 4 / 2 x 3 x 4 x 5 : 1/5
=1/5 : 1/5
=1
Cho x2−2(m−1)x+(m+1)2=0x2−2(m−1)x+(m+1)2=0 có 2 nghiệm x1, x2 t/m x1+x2≤4x1+x2≤4. Tìm MAX, MIN của P=x31+x32+x1.x2(3x1+3x2)+8x1.x2
Câu 1: Tìm x và y biết
xy,y- yy,x=x,x
Câu 2 :Tinh nhanh
a / 4,9x (159-110) +(3,5+1,4) x(21+19)+(6,2-1,3)
b/ 8x 2 x0,125 x1/4x1/2x4
1/8x1/10:1/8=1/8x1/10x...=....?
1\2x1/4x1/6=
1/2x1/4;1/6=
1/2;1/4x1/6=
8 x8 - 8x1 =
8 x 8 - 8 x 1
= 64 - 8
=56.
Đúng 100 %!
Ai tk cho mình mình tk lại.
4x2/5x3/4x1/6x5x6
\(4\times\dfrac{2}{5}\times\dfrac{3}{4}\times\dfrac{1}{6}\times5\times6=\dfrac{8}{5}\times\dfrac{3}{24}\times5\times6=\dfrac{1}{5}\times5\times6=\dfrac{5}{5}\times6=1\times6=6\)
1984=1x10000+9x.... +8x10+4x1