Đề cương ôn tập Toán 6 học kì 2 năm 2019-2020

ÔN T P TOÁN 6 PH N 1( Ph n ki n th c đã h c trên l p )Ậ Ầ ầ ế ứ ọ ớ

Bài 1: Th c hi n phép tính ự ệ

HD: Áp d ng tính ch t k t h p ụ ấ ế ợ

a.8).25.(-2). 4. (-5).125

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HD: Áp d ng tính ch t phân ph i ụ ấ ố

b. (-12).46 – 12.54

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c(-14).25

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d (-47). (-5)

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HD: Áp d ng tính ch t phân ph i ụ ấ ố

e 125.( -24) + 24.225

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Bài 2: a) Tìm t t c các c c a 5, 9, 12, -13, 1, -8ấ ả ướ ủ

HD: Tìm các c nguyên âm và nguyên d ng ướ ươ

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Tr ng THCS Giá Rai Aườ

H vàọ

tên................................

L p........................................ớ

Nh n xét c a giáo viênậ ủ

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b) Tìm b i c a -3 ; 5; -7 ; 9ộ ủ

HD: Tìm các b i nguyên âm và nguyên d ng ộ ươ

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Bài 3: B ngo c r i tính ỏ ặ ồ

HD: Quy t c b d u ngo c( n u tr c d u ngo c là d u c ng thì d u bên trong ắ ỏ ấ ặ ế ướ ấ ặ ấ ộ ấ

d u ngo c đó gi nguyên n u tr c d u ngo c là d u tr thì d u bên trong d u ấ ặ ữ ế ướ ấ ặ ấ ừ ấ ấ

ngo c đó thay đi c ng thành tr và tr thành c ngặ ổ ộ ừ ừ ộ )

1) -7264 + (1543 + 7264)

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2) (144 – 97) – 144

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3) (-145) – (18 – 145)

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4) 111 + (-11 + 27)

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5) (27 + 514) – (486 – 73)

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6) (36 + 79) + (145 – 79 – 36)

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7) 10 – [12 – (- 9 - 1)]

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8) (38 – 29 + 43) – (43 + 38)

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9) 271 – [(-43) + 271 – (-17)]

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10) -144 – [29 – (+144) – (+144)]

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Bài 4: Tính t ng các s nguyên x bi t: ổ ố ế

HD: Ta th c hi n hai b cự ệ ướ

B c 1: Li t k các sướ ệ ế ố

B c : Tính t ng các s v a li t kêướ ổ ố ừ ệ

1) -20 < x < 21

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2) -18 ≤ x ≤ 17

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3) -27 < x ≤ 27

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Bài 6: Tính giá tr c a bi u th c ị ủ ể ứ

HD: Thay x= 2010 vào th c hi n phép tính ự ệ

1) x + 8 – x – 22 v i x = 2010 ớ

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HD: Thay x= -98; a=99 vào th c hi n phép tính ự ệ

2) - x – a + 12 + a v i x = - 98; a = 99 ớ

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HD: Thay m= -123; a=1 vào th c hi n phép tính ự ệ

3) a–m + 7–8 + m v i a = 1; m = - 123 ớ

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HD: Thay m= 72; x=3 vào th c hi n phép tính ự ệ

4) m –24–x + 24 + x v i x = 3; m = 72ớ

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HD: Ta b d u ngo c thay p= -24 vào th c hi n phép tính ỏ ấ ặ ự ệ

5) (-90) – (y + 10) + 100 v i p = -24 ớ

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Bài 7: Tìm x

HD: Th c hi n đy đ các b cự ệ ầ ủ ướ

1) (2x – 5) + 17 = 6

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2) 10 – 2(4 – 3x) = -4

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3) - 12 + 3(-x + 7) = -18

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4) 24 : (3x – 2) = -3

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Bài 8

Vi t các phân s sau d i d ng phân s co m u d ng: ế ố ướ ạ ố ẫ ươ



;



;



;



;

HD: Ta nhân t và m u c a phân s v i s nguyên âmử ẫ ủ ố ớ ố

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BÀI 9

Đi n đúng (Đ) sai (S) vào các ô vuông sau đây:ề

−

là phân s t i gi n ố ố ả c)

−

là phân s t i gi n ố ố ả

−

không ph i là phân s t i gi n d) ả ố ố ả

không ph i là phân s t i gi nả ố ố ả

BÀI 10: Rút g n các phân s sau:ọ ố

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HD: Ta chia t và m u cho cùng m t sử ẫ ộ ố

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BÀI 11

Rút g n các phân s sau:ọ ố

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HD: Ta chia t và m u cho cùng m t sử ẫ ộ ố

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