113.(tr99,ko hieu dc trong sach nha)
| 5 | ||
| 4 | 0 |
Hay dien cac so 1,-1,2,-2,3,-3,vao cac o trong o hinh vuong ben(moi so vao 1 o ) sao cho tong 3 so tren moi dong,moi cot hoac moi duong cheo deu bang nhau
114.Liet ke va tinh tong tat ca cac so nguyen x thoa man:
a) -8 < x < 8 b) -6 < x < 4 c) -20 < x < 21
118.Tim so nguyen x biet :
a) 2x - 35 = 15 ; b) 3x + 17 = 2; c) | x - 1 | = 0
119. Tinh bang 2 cach:
a) 15 x 12 - 3 x 5 x 10 b) 45 - 9 x ( 13 + 5 ) c) 29 x ( 19 - 13 ) - 19 x ( 29 - 13 )
120. Cho 2 tap hop : A = { 3;-5;7} ; B = { -2;4;-6;8}
a) Co bao nhieu tich ab ( voi a thuoc A va b thuoc B ) duoc tao thanh?
b) Co bao nhieu tich lon hon 0,bao nhieu tich nho hon 0?
c) Co bao nhieu tich la boi cua 6?
d) Co bao nhieu tich la uoc cua 20?
Giup mk nha may bn dang can gap
