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2022-12-22 19:59:59
Đầu tiên vẽ tia SI và RI , sao cho tia đó vuông góc với nhau
SI thẳng đứng , RI nằm ngang từ phải sang tráo
Vẽ tia , sao cho NI là phân giác của SI và RI
Vẽ gương vuông góc vs NI
2022-12-22 19:57:01
tìm a 80x100:25=320
20%của a là 320:100x20=64