英文數學題 10 marks

(a) Rachel answered all questions but got 7 wrong . What was her total marks ?
ans:
she got 13 qs correct and 7 wrong
13x5+7x -3
= 65-21
= 44

b) Alan answered all questions but only got 4 correct . What was his total marks ?
ans:
she got 4 qs correct and 16 wrong
4x5+ 16x -3
=20-48
=-28<0
=0

(c) Joseph aswered 15 questions but got 7 wrong . What was his total marks ?
ans:
she got 8 qs correct and 7 wrong
8x5+ 7x -3
=40-21
=19

(d)Ann answered 10 questions but only got 4 correct . What was her total marks ?
ans:
she got 4 qs correct and 6 wrong
4x5+ 6x -3
=20-18
=2

題目 mc岩 mc錯 mc無答 total marks
a)rachel 13題x5分+ 7題x -3分 + 0題x0分 = 44分

b)alan 4題x5分+ 16題x-3分 + 0題x0分 = 0分(應該係-28分,但係題目話少過0分當
0分計)
c)joseph 8題x5分+ 7題x-3分 + 5題x0分 = 19分

d)ann 4題x5分+ 6題x-3分 + 10題x0分= 2分


有唔明,再問,我再答你~

Rachel:(+5)x(20-7)+(-3)x7
=65-21
=44
Alan:(+5)x4+(-3)x(20-4)
=20-48
=(-28)
=0
Joseph:(+5)x(15-7)+(-3)x7+0x(20-15)
=40-21+0
=19
Ann:(+5)x4+(-3)x(10-4)+0x(20-10)
=20-18+0
=2

1,(20-7)x5-7x3=44

2,(20-4)x5-4x3=68

3,(15-7)x5-7x3=19

4,4x5-(10-4)x3=2

a) 13*5- 7*3 = 44
b) 4*5-16*3= -8 = 0
c) 8*5-7*3= 19
d) 4*5-6*3=2

a)(20-7)*5+7*(-3)
=70-21
=49
答錯了7題,就將7乘-3,其他既當佢答岩,就係20-7再乘5
b)4*5+(20-4)*(-3)
=20+(-48)
=-28
=0(Total mark less than 0 will be regarded as 0 .)
這題講答岩4題,就係4乘5,咁答錯既就有20-4,姐係16,再乘(-5),而因為你會總分少過0就當0,所以答案係0
c)(15-7)*(5)+7(-3)
=40+(-21)
=19
同a既計法一樣,但佢只答左15題,其他無答,係0,所以個5題就唔需要計
d)4*5+(10-4)*(-3)
=20-18
=2
計法同b,c 一樣