Làm ơn giải giúp mình với, mình cần gấp
Bài 1: Tìm x biết:
a) (x – 10).11 = 22 b) 2x + 15 = –27 c) –765 – (305 + x) = 100
d) 2x: 4 = –16 e) 25 < 2x < 257 f) 3x – 10 = 2x + 13
g) (50 – 6x).18 = 23.32.5 h) 3(x – 2) + 2x = –31 i) 5.(12 – x ) – 20 = 30
k) 2.(x–1) + 3(x–2) = x–4 l) 6x + 24= 2x – 12 m) x + 8 = 10 – x
n) 14 + 4x = 3x + 20 q) 6x + 4x = 2020 q) 4.(2x + 7) – 3.(3x – 2) = 24
t) (75 + 79).(54 + 56).(33.3 – 92)=0 r) 3.(4 – x) – 2.( x– 1) = x + 2012
u) ( x + 1) + (x + 2) + (x+3) +…+ (x + 100) = 7450
Bài 2: Tính hợp lí nếu có thể:
a) (+12).13+13.( –22) b) {[7.( –1)]+7}:2020 c) (– 145) – (18 – 145)
d) 111 + (–11 + 27) e) 35. 18 – 5. 7. 28 f) 45 – 5. (12 + 9)
g) (27 + 514) – (486 – 73) h) (36 + 79) + (145 – 79 – 36)
i) 10 – [12 – (– 9 – 1)] k) (38 – 29 + 43) – (43 + 38)
l) 271 – [(–43) + 271 – (–17)] m) –144 – [29 – (+144) – (+144)]
n) 24. (16 – 5) – 16. (24 – 5) p) 29. (19 – 13) – 19. (29 – 13)
q) 31. (–18) + 31. (– 81) – 31 r) (–12).47 + (–12). 52 + (–12)
t) 13.(23 + 22) – 3.(17 + 28) u) (–48) + 48. (–78) + 48.( –21)
Loga
Sinh Học lớp 12
