Câu hỏi của Pham Ngoc Diep

Question

Bài 1.  Tìm số nguyên x biết:a) x – 15 = – 21;b) 42 – x = – 7;c) 12 – (30 – x) = – 23;d) 31 – (17 + x) = 18.Mik sẽ tick nha

Hiền Tạ · Accepted Answer

`a)``x-15 = -21``<=> x = -21 + 15``<=> x = -6``b)``42 - x = -7``<=> x = 42 - (-7)``<=> x = 42 + 7``<=> x = 49``c)``12 - (30-x) = -23``30-x = 12 - (-23)``30-x = 35``x = 30-35``x = -5``d)``31 - (17+x)=18``<=> 17+x = 31-18``<=> 17+x =13``<=> x = 13-17``<=> x = -4` Câu trả lời: `a)``x-15 = -21``<=> x = -21 + 15``<=> x = -6``b)``42 - x = -7``<=> x = 42 - (-7)``<=> x = 42 + 7``<=> x = 49``c)``12 - (30-x) = -23``30-x = 12 - (-23)``30-x = 35``x = 30-35``x = -5``d)``31 - (17+x)=18``<=> 17+x = 31-18``<=> 17+x =13``<=> x = 13-17``<=> x = -4`

a) x+ 118 =218	b) 18 – x =-17	c) (-18) – x =-17
d)124 +(118 – x)=217	e) (3x – 6).3 = 3⁴	g) 23.(42 – x) = 46
h) 84 – (3x + 8) = 34	i) 3(2x + 1) -19 = 14	k) 6x – 302 = 2³.5
m) (x -1)²= 81	n) 2^x+1- 5 =27	m) 2^x+ 2^x+1+ 2^x+2 = 56

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)

a) x – 15 = – 21;	b) 42 – x = – 7;
c) 12 – (30 – x) = – 23;	d) 31 – (17 + x) = 18.