Tính tổng

D=1-5-9+13+17-21-25+...+145-149-153

[1] Cho hai tập hợp A = { 1; 5; 9; 13 ;17; 21; 25 } và B = { 0; 1; 3; 5; 10 ; 13 }. Tìm A \(\cap B\)

A. A ∩ B = { 0; 1; 3; 5; 9; 10; 13; 17; 21; 25 }           B. A ∩ B = { 1; 5; 13 }

C. A ∩ B = { 9; 17; 21; 25 }                   D. A ∩ B = { 0; 3; 10}

1/5*9+1/9*13+1/13*17+1/17*21+1/21*25+1/25*29+1/29*33+1/33*34

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+149+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39*100

5. -145.(13 - 57) + 57 (10 - 145)

7. 199.(15 - 17) -199.(-17 + 5)

8. -39.(5 - 99) + 99.(10 - 39)

9. -38.(25 - 4) + 25.(-4 + 38)

5. -145.(13-57) +57.(10-145)

7. 199.(15-17) -199.(-17+5)

8. -39.(5-99) +99.(10-39)

9. -38.(25-4) + 25.(-4+38)

a) 25 . 8 - 12 . 5 + 272 : 17 - 8
b) 125 : 25 + 14 - 142 : 71
c) 13 . 17 - 256 : 16 + 14 :7 -1
d) 15 . 24 - 14 . 5 ( 145 : 5 - 27 )
2, Tìm X, biết:
a) 37 + x = 55
b) x - 31 = 24
c) 21 ( x  - 11 ) = 21
d) 9 . ( x - 29 ) = 0
e) ( x - 1954 ) . 5 = 50 
f) 30 . 60 - x = 30

Tính hợp lí

1) -145.(13 - 57) + 57.(10 -145)

2) 17.(15 - 16) + 16.( 17- 20)

3) -38.(25 - 4) + 25.(-4 + 38 )

4) 23.(145 - 17) - 145.(23 - 6)

5) 24.(15 - 4) + 4.(24 - 15)

6) 199.(15 - 17) - 199.(-17 + 5)

7) -39.(5 - 99) + 99.(10 - 39)

Bµi 1 1 37064 – 64 x 82 42966 217 2 320 – 120.5 95,25 5,25 874 12 x 12,53 132 x 9 132 4 48 x 17 48 x 3 5 56 x 27 56 x 35 62 6 45 x 48 – 90 x 24 145 7 754 x 75 – 2262 x 25 4568 8 1050 15 – 350 5 1769 4320 9 – 8640 18 750 10 316 192 384 321 108 11 24 25 26 ….. 124 125 126 12 154 – 153 152 – 151 150 – 149 ….. 4 – 3 2 – 113 37 x 38 – 19 x 74 1000 14 0.48 x 500 – 2.4 x 40 x 2