Tìm số nguyên x: a) 46 – x = –21 + (–87) b) x – 96 = (443 – x) – 15 c) (–x + 281 +534) = 499 + (x – 48) d) –(754 + x) = (x – 12 – 741) – 23.

Tìm số nguyên x:

a) 46 – x = –21 + (–87)

b) x – 96 = (443 – x) – 15

c) (–x + 281 +534) = 499 + (x – 48)

d) –(754 + x) = (x – 12 – 741) – 23.

Trả lời

Lời giải

a) 46 – x = –21 + (–87)

46 – x = –108

x = 46 – (–108)

x = 154

Vậy x = 154.

b) x – 96 = (443 – x) – 15

x – 96 = 443 – x – 15

x – 96 = 428 – x

x + x = 428 + 96

2x = 524

x = 262

Vậy x = 262.

c) (–x + 281 +534) = 499 + (x – 48)

–x + 281 +534 = 499 + x – 48

–x + 815 = 451 + x

815 – 451 = x + x

364 = 2x

182 = x

Vậy x = 182.

d) –(754 + x) = (x – 12 – 741) – 23

–754 – x = x – 12 – 741 – 23

–754 – x = x – 776

–754 + 776 = x + x

22 = 2x

11 = x

Vậy x = 11.

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