mình cần gấp Bài 1. Thực hiện phép tính ( nhanh nếu có thể) a) (-370) + 114 + 236 + 370 b) (-120) + (-130) + 360+ (-110) c) 25 + 37 – 48 – 25 – 37 d) (-125) – (19 – 125) e) 100 – [25 – (-19 – 11)] f) 271 – [(-43) + 271 – (-17)] g) 35.(-29) + (-29).65 h) 22. (-8). (-25). (125). 18 i) 48 : (-6. 4 + 8) j) -3. 7 – 4. (-5) + 1 k) 16 + (102 - 7.6) - (94.17 - 27. 94) l) -2019.2020 + 1010.38 m) 1-2-3-4+5-6-7-8+9-10-11-12+…+97-98-99-100. Bài 2. Tìm số nguyên x biết: a) -20 + 35 - x = - 20 b) 3x + 17 = 12 c) │x - 6│= 0 d) lxl+lyl < 2 e) -13 .│x│ = 39 f) -2 +(-3) g) 12 x và x < 0 h) (7x - 11)3 = 25.52 + 200 i) 5mũx = 125 j) 5mũ2x-3 -2.5mũ2 = 3.5mũ2 k) x/5=-2/10 l) -1/-8=x/-24 m) 5x+9/240=39/40 Bài 3. Cho A= 1+ 4 +4 mũ 2+4 mũ 3+4 mũ 4+4 mũ 5...4 mũ 16+4 mũ 17 Chứng minh rằng: A chia hết cho 21; chia hết cho 5 và chia hết cho (-105) Bài 4. Cho A=1+2020+2020 mũ 2+2020 mũ 3+2020 mũ 4+2020 mũ 5+2020 mũ 97+2020 mũ 98 So sánh A với 2020.2020 mũ 80 - 2 Bài 5. Tìm x ,y, z biết: x-y=2018; y-z = -2019; z+x= 2020 Bài 6. Tìm hai số nguyên a và b biết tổng của chúng bằng ba lần hiệu a-b, còn thương a:b và hiệu a-b là hai số đối nhau. Bài 7.Tìm số tự nhiên n để cả ba phân số sau đều là số nguyên: 15/n;12/n+2;6/2n-5 Bài 8. Hãy khoanh tròn đáp án đứng trước câu trả lời đúng. Câu 8.1. Số đo của góc bẹt là : A. 1800 B. 450 C. 900 D. 800 Câu 8.2. Cho góc xOy có số đo là 90o. Góc xOy là góc: A. Nhọn B. Vuông C. Tù D. Bẹt Câu 8.3. Một góc không phải là góc tù thì là góc nhọn A. Đúng B. Sai Câu 8.4. Một góc bé hơn góc bẹt thì là góc tù A. Đúng B. Sai Câu 8.5. Góc vuông nhỏ hơn góc bẹt A. Đúng B. Sai Câu 8.6. Góc tù có số đo: A. Nhỏ hơn 90o B. Lớn hơn 0o nhỏ hơn 90o C. Nhỏ hơn 180o D. Lớn hơn 90o nhỏ hơn 180o Bài 9. Bổ sung chỗ thiếu(…) trong các phát biểu sau: a, Góc xOy là hình gồm………………………………………………………………….. b, Góc xOy được kí hiệu là………………………………………………………………. c, Góc bẹt là góc có …………………………………………………………………….. Bài 10. Dùng thước đo độ, đo các góc có trong hình 21- SGK- tr79

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