297+ x + 846 =1280
297 +x = 1280 - 846
297 +x = 434
x= 434 - 297
x=137
297+x+846=1280
(297+846)+x=1280
1143+x=1280
x= 1280-1143
x=137
297 + x + 846 = 1280
297 + x = 1280 - 846
297 + x = 434
x = 434 - 297
x = 137
Đáp số: x = 137
\(297+x+846=1280\\ x+846=1280-297\\ x+846=983\\ x=983-846\\ x=137\)
\(297+x+846=1280\)
\(297+x=1280-846\)
\(297+x=434\)
\(x=434-297\)
\(x=137\)
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297 + x + 846 = 1280
297 + x = 1280 - 846
297 + x = 434
x = 434 - 297
x = 137
