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Giúp mk với!!!tối phải nộp rùi

1. Tìm số nguyên a sao cho : (a-2) là ước của - 5 2. Tìm số nguyên a sao cho : (4a - 3) chia hết (a + 2)

Giúp mình phần này với nếu đc thì giải thích cách lm cho mình luôn ạ

tìm x biết a ) ;15-(14-x)=6 c;x-(12-25)=-8 b;-30+(25-x)=-1 d;(x-29)-(17-38)=-9

Một thấu kính hội tụ có tiêu cự 16cm, một nguồn sáng điểm S được đặt nằm trên trục chính của thấu kính đó và cho ảnh S’ trùng với một tiêu điểm chính. Vậy S đặt cách thấu kính một khoảng bằng A: 16cm. B: 24 cm. C: 48cm. D: 8 cm.

Chỉ mình câu 2 nha mình cảm ơn nhiều

giup 5,6 voi nha 5 vote and thanks

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