编制数学模型
303页1、 DEAR GCSE WLc STUDENT Youll want to be sure of your best grade in the limited time thats available for practice and revision. Thats what this book provides. - Tightly focussed on the syllabus you dont have to revise anything you wont be assessed on. - The work is set around worked examples which highlight key skills and real exam questions - so all your practice leads to performance where it counts: on coursework, in mocks and on the exam. - The first 10 units revise all the topics examined - l
2、eading to the all-important grade e“. - Take Progress Tests 1. 2 and 3 and see how youre doing on the way to grade He“ and beyond: the answers tell you what you need to work at. - Polish your higher grade skills on Units 11-14 and check your progress in Test 4. -If you are taking a Mental Arithmetic test, unit 15 helps with these skills and gives you practice. Per- suade a friend to read them out With practice youll achieve the high scores that are important in these tests. I hU)lL L+ b, I .1 J,
3、O)k 00V . l( fetJ MMe. CtM-Adt M. fo.J, J , 13 . . A pfLoMe. fVWoer QCWCM be. cMlfd4d b . OAcl eJj. (, lS f() RuLe.s. (W s,JCUQ bq(, .I;. b.15 . (iv) tratOL .Iftcts l. 3. E 10 . , . . . . . , . . 1l,“Q OfOti . WOA.O To .AA.N. fo.c.c:rC“: 0 tbr t cJ.i.Nid.at UQ.t. o Utc.t, 8 ,“ 0. f 1-7 = 4 remainder 2. The day of the week is 2 days after Saturday, i.e. it is Monday. Topic: BODMAS _ EJlAIIIU 3 Find the value of: (i) 6 x (18 -;-2) - 3; (ii) (3 x 6) -;-(2 x 6 -3) .“. These questions need the BODMAS
4、 rule. (i) Brackets first, so 6 X (18 -;-2) -3 = 6 X 9 -3 Of and divide do not appear, so Multiply next gives 54 -3. Add does not appear. Subtract gives the answer 51. Hence, 6 X (18 -;-2) -3 = 6 X 9 -3 = 54 -3 = 51. (ii) There are two sets of brackets here, so each one is worked out separately. First bracket = 3 X 6 = 18 Second bracket = 2 X 6 -3 (Multiply) = 12 -3 (Subtract) = 9 Hence we have (3 X 6) -;-(2 X 6 -3) = 18 -;-9 = 2. 10 Number Topic: types of number WDIIICED EXAMPLE 4 Look at this
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