1-2+3-4+5-6+...+99-100+101-102+103
=(1-2)+(3-4)+(5-6)+...+(99-100)+(101-102)+103
=-1×51+103
=-51+103
=42
Đáp án:
42
Giải thích các bước giải:
* Chúc em học tốt*
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Mn làm giúp mình bài 28 nhé mình vote 5* cho
cho tam giác ABC vuông tại A đường cao AH.vẽ đường tròn đường kính AH cắt AB, AC lần lượt tại D,E.chứng minh tứ giác AEHD là hình chữ nhật
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