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1. The lenth of a retangle is 3x cm and the width is (2x + 1) cm .
If the lenth is the 11cm longer than the width,find the lenth of the retangle.
2. If the 15th term of the sequence 3 , 3 + x , 3 + 2x , 3 + 3x , ......is 31,
find the 34th term of this seqience.
3. Marry spends $825 to buy a T-shirt and a coat.The price of T-SHIRT is $258 cheaper thanHalf of the price of the coat.
How much is the coat?
4. Some sweets are shared by a group of children.If each child gets 5 sweets , 8 sweets will be left.
If each child wants to get 7 sweets, 10 more sweets will be needed . How many sweets are there?
5. Suppose each kilogram of pork costs $15 and each kilogram og beef costs$21. If Susan uses$140
to buy 8kilograms of pork and beef altogether,how many kilograms of beef does she buy?
6. Find two consecutive integers such that 3/5 of the larger number exceeds 1/4 of the smaller one by 5¤S2¥÷¤§¤@
7. §â64¼g¦¨³sÄò©_¼Æ¤§©M¡C(´£¥Ü : 64¬°¥¿¤è§Î¼Æ)
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µoªí©ó 2007-8-26 02:22 PM
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1.3x-(2x+1)=11
3x-2x-1=11
3x-2x=11+1
x=12
2.3+14x=31
14x=31-3
14x=28
x=28°£14
x=2
3+(34-1)¼2
=3-33¼2
=3+66
=69
3.(2¤À¤§x - 258)+x=825
2¤À¤§x+x=825+258
2¤À¤§3x=1083
3x=1083¼2
3x=2166
x=2166°£3
x=$722
4.5x+8=7x-10
5x-7x=-10-8
-2x=-18
x=9
9¼5+8
=53
5.15¼8=120
150-120=20
20°£21
¤j¬ù=0.95
6. 5¤À¤§3(x+1)-4¤À¤§x=5¤S2¤À¤§1
5¤À¤§3x+5¤À¤§3-4¤À¤§x=5¤S2¤À¤§1
(5¤À¤§3-4¤À¤§1)x=5¤S2¤À¤§1-5¤À¤§3
20¤À¤§12-5x=10¤À¤§55-6
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Elaine
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