Đáp án:
Giải thích các bước giải:
55+45+x=200
100+x=200
x=200-100
x=100
x = 100
Ta có : 55 + 45 + x = 200
<=> 100 + x = 200
<=> x = 200 - 100
<=> x = 100
Vậy x = 100
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