`(a-b-c)-(a+b-c)`
`=a-b-c-a-b+c`
`=-2b`
Dấu trừ ở ngoài ngoặc thì ở trong đổi dấu.
Đáp án:
Giải thích các bước giải:
`(a - b - c) - (a + b - c)`
`= a - b - c - a - b + c`
`= (a - a) + (-b - b) + (-c + c)`
`= 2(-b)`
Giải đầy đủ các bước nha!! Vote 5* và clhn nếu làm đúng.
Cho đường tròn (C) : $(x + 2)^{2}$ + $(y - 5)^{2}$ = 36 Tìm ảnh của đường tròn (C) bằng cách thực hiện liên tiếp hai phép biến hình. Phép đối xứng trục Ox và phép vị tự tâm I(3 ; 7), tỉ số k = -4
cho pt mở ngoăc m -2 đóng ngoặc x bình -2 mở ngoặc m cong 1 dóng ngoăc x cong m =o
bài 1:tính nhanh 173+350-73+150=? 550-456+150=? giúp với nha!@
ai giúp em làm với , nhờ mn nha
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