Toán Lớp 5: tìm x (3 x X- 1 1/3) :1 1/3 -1=1 1/3 (3/2 x X +1) x 1 1/2+ 1 1/3=3

Question

Toán Lớp 5:  tìm x (3 x X- 1 1/3) :1 1/3 -1=1 1/3 (3/2 x X +1) x 1 1/2+ 1 1/3=3

tuyen98 · Answer

a)(3&times;x-1(1)/3):1(1)/3-1=1(1)/3      (3&times;x-4/3):4/3-1=4/3      (3&times;x-4/3):4/3=4/3+1      (3&times;x-4/3):4/3=4/3+3/3      (3&times;x-4/3):4/3=7/3      3&times;x-4/3=7/3&times;4/3      3&times;x-4/3=28/9      3&times;x=28/9+4/3      3&times;x=28/9+12/9      3&times;x=40/9            x=40/9:3            x=40/9&times;1/3            x=40/27   Vậy x=40/27   b)(3/2&times;x+1)&times;1(1)/2+1(1)/3=3       (3/2&times;x+1)&times;3/2+4/3=3       (3/2&times;x+1)&times;3/2=3-4/3       (3/2&times;x+1)&times;3/2=9/3-4/3       (3/2&times;x+1)&times;3/2=5/3       3/2&times;x+1=5/3:3/2       3/2&times;x+1=5/3&times;2/3       3/2&times;x+1=10/9       3/2&times;x=10/9-1       3/2&times;x=10/9-9/9       3/2&times;x=1/9                x=1/9:3/2                x=1/9&times;2/3                x=2/27   Vậy x=2/27

trucoanh55 · Answer

( 3 xx x - 1 1/3 ) : 1 1/3 - 1 = 1 1/3   ( 3 xx x - 4/3 ) : 4/3 - 1 = 4/3   ( 3 xx x - 4/3 ) : 4/3 = 4/3 + 1   ( 3 xx x - 4/3 ) : 4/3 = 7/3   3 xx x - 4/3 = 7/3 xx 4/3   3 xx x - 4/3 = 28/9   3 xx x = 28/9 + 4/3   3 xx x = 40/9   x = 40/9 : 3   x = 40/27   Vậy , x = 40/27 .   ________________________________   ( 3/2 xx x + 1 ) xx 1 1/2 + 1 1/3 = 3   ( 3/2 xx x + 1 ) xx 3/2 + 4/3 = 3   ( 3/2 xx x + 1 ) xx 3/2 = 3 - 4/3   ( 3/2 xx x + 1 ) xx 3/2 = 5/3   3/2 xx x + 1 = 5/3 : 3/2   3/2 xx x + 1 = 10/9   3/2 xx x = 10/9 - 1   3/2 xx x = 1/9   x = 1/9 : 3/2   x = 2/27    Vậy , x = 2/27 .