6+4+3+7+2+8+9+1+444+x=672
=> 10 + 10 + 10 + 10 + 444 + x = 672
=> 484 + x = 672
=> x = 672 - 484
=> x = 188
6 + 4 + 3 + 7 + 2 + 8 + 9 + 1 + 444 + x = 672
=> 1 + 2 +3 + 4 + 6 + 7 + 8 + 9 + 444 + x = 672
=> (1+9) + (2+8) + (3+7) + (4 +6) + x = 672 - 444
=> 10 + 10 + 10 + 10 + x = 228
=> 40 + x = 228
=> x = 228 - 40
=> x = 188
6+4+3+7+2+8+9+1+444+x=672.
(6+444)+(3+7)+(2+8)+(9+1)+4+x=672.
450+10+10+10+4+x=672.
484+x=672
x=672-484
x=188
Trả lời:
6+4+3+7+2+8+9+1+444+x=672
486 + x = 672
x = 672 -486
x = 188