Tìm X biết: 13x(X-5)=7xX+25
21X-5x2+3-7=7xX
21X-5x2+3-7=7xX
Tìm X
3xX+7xX=100
tìm x
a, x +27 =96+17
b, x-210:21=25
c, (x+8,7)x10,8=270
d, 7xX -4x X =35-2
a, X-3/4-3/28-3/70-3/130-3/208= 1/6
b, (1/15+1/35+1/63)xX =1
C, 242/363+1616/2121=2/7xX
mọi người SOS tui nhé
a,123+345+57x2
b, 123 + 77 + 55+ 55
123 + 345 =
123+345+678=
