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Mathematics, 18.06.2021 04:20 harleeGirl

Cho khối chóp sabc có sa vuông với đáy tam giác abc vuông tại b ac=2a bc=a sb=2a tính góc giữa sa và sbc

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Cho khối chóp sabc có sa vuông với đáy tam giác abc vuông tại b ac=2a bc=a sb=2a tính góc giữa sa và...

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