297 + x + 846 = 1280
197 + x = 1280 - 846
197 + x = 434
x = 434 - 197
x = 237
ủng hộ nha!
297 + x + 846 = 1280
297 + x =1280 - 846
297 + x =434
x =434 - 297
x =137
297+x+846=1280
297+x=1280-846
297+x=434
x=434-297
x=137
297 + x + 846 = 1280
x + 846 = 1280 - 297
x + 846 = 983
x = 983 - 846
x = 137
hoặc : 297 + x + 846 = 1280
x + 1143 = 1280
x = 1280 - 1143
x = 137