Tìm x biết a) 1/4 -x = 1/20 + (-2) b) -2/5 -x = 4/15 + -1/3
Giải thích
a)
14−x=120+(−2)14−x=−3920x=14−−3920=520+3920=4420=115
b)
−25−x=415+−13−25−x=−115x=−25−−115=−615−−115=−515=−13
a)
14−x=120+(−2)14−x=−3920x=14−−3920=520+3920=4420=115
b)
−25−x=415+−13−25−x=−115x=−25−−115=−615−−115=−515=−13