數學的問題(代數).........

1.b---10+5=15
2.c---20-5=15
3.a--- 5x/5=15/5......x=3
4.d---75/5=15




2a/.1,4,7,10,13,16,19....全部+3
2b/.2,6,18,54,162,486,1458.......全部係前面個數x3
2c/.16,25,36,49,64,81,100-----由4ge2次方...10ge2次方

13,16,19, 162, 366

(一).
(1)
x+5=15
x+5-5=15-5
x=10 (B)
(2)
x-5=15
x-5+5=15+5
x=20 (C)
(3)
5x=15
5x÷5=15÷5
x=3 (A)
(4)
x
--- X 5=15 X 5
5
x=75 (D)

(二).
(2) 寫出以下數 3
(a) 1 , 4 , 7 , 10 , (13) , (16) , (19)
(b) 2 , 6 , 18 , 54 , 162) , (486) , (1458)
(c) 16 , 25 , 36 , 49 , (64) , (79) , (95)

(1) (2)
1.B (a) 1,4,7,10,__13__,__16_,_19___
2.C (b) 2,6,18,54,_162___,_486___,_1458___
3.A (c) 16,25,36,49,_64___,_81__,_100___
4.D

1]b
2]c
3]a
4]d

2a]13,16,19[[因每個數+3]]
2b]162,486,1458[[因每個數係之前果個ge 3倍]]
2c]64,81,100[[因為25-16=9..36-25=11..49-36=13..姐係把前面果數+去單數的..15..17..19]]

1.B (15-5)
2.C (15+5)
3.A (15/5)
4.D (15x5)

(a).13,16,19 (+3)
(b).162,486,1458 (x3)
(c)64,81,100 (+9,11,13,15,17,19)

1. x+5=15=( B.10)
2. x-5=15=(C.20)
3. 5x=15=(A. 3)
4. 5分之x=15=(D. 75)

(2) 寫出以下數3
(a) 1,4,7,10,_13_,_16__,_19___
(b) 2,6,18,54,_162_,_486_,_1458_
(c) 16,25,36,49,_64_,_81_,_100__

1.B
2.C
3.A
4.D

(2)
(a)13,16,19
(b)162,486,1458
(c)64,81,100

1 B
2 C
3 A
4 D

a 13 16 19
b 162 486 1458
c 64 81 100

唔知岩唔岩! xP