1, 3, 6, 18, 21, (), () fill in the blanks according to the rules

1, 3, 6, 18, 21, (), () fill in the blanks according to the rules

Answer: 1,3,6,18,21, (63), (66)
law:
1X3=3
3+3=6
3X6=18
18＋3=21
21×3=63
63+3=66
66×3=198
198+3=201
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The product of the two factors is 21.6. If one of the factors is expanded to 9 times and the other is expanded to 3 times, what is the product?

Let two factors be x and Y respectively, then x * y = 21.6
(X*9)*(Y*3)=X*Y*9*3=21.6*9*3=583.2

5 / 18 * 3 / 7 * 3 / 5 3 / 4 * 2 / 3 + 1 / 6 8 / 9 * 3 / 4 + 5 / 6 7 / 8-4 / 7 * 7 / 16 what is the 14 times of the sum of 2.3/7 and 5 / 21? What is the 14 times of the sum of 3.3/7 and 21 / 5
What is the sum of the two? What can be easily worked out in calculation problems should be simply worked out

5 / 18 * 3 / 7 * 3 / 5 = (5 × 3 × 3) / (18 × 7 × 5) = 1 / 143 / 4 * 2 / 3 + 1 / 6 = 1 / 2 + 1 / 6 = 3 / 6 + 1 / 6 = 4 / 6 = 2 / 38 / 9 * 3 / 4 + 5 / 6 = 2 / 3 + 5 / 6 = 4 / 6 + 5 / 6 = 9 / 6 = 3 / 27 / 8-4 / 7 * 7 / 16 = 7 / 8-1 / 4 = 7 / 8-2 / 8 = 5 / 83 / 7 and 5 / 21

2÷3÷7+4÷6÷14+14÷21÷494÷7÷9+8÷14÷18+28÷49÷63=______ ．

The original formula = 2 × 13 × 17 + 4 × 16 × 114 + 14 × 121 × 149 & nbsp; & nbsp; & nbsp; & nbsp; 4 × 17 × 19 + 8 × 114 × 118 + 28 × 149 × 163 & nbsp;, = 221 (1 + 12 + 17) & nbsp; 463 (& nbsp; 1 + 12 + 17), = 32

What are the equal scores? 1 / 2 / 4 / 3 / 49 / 14 / 45 / 18 / 28 / 21 / 100 / 50 / 7 / 2
What are the equal scores? 1 / 2 / 4 / 3 / 49 / 14 / 45 / 18 / 28 / 21 / 100 / 50 / 7 / 2

1 / 2 = 50 / 100
14 out of 49 = 2 out of 7
18 out of 45 = 2 out of 5
21 out of 28 = 3 out of 4

2 and 7 out of 18 + 3 out of 16 - 7 out of 18 =? 1 and 4 out of 5 - 7 out of 9 + 7 out of 18 =?
Sorry, "seven out of 18" is wrong. It's "two and a fifth."

35 out of 16, 37 out of 40

8:3-23:7 + 12:5 + 2:11

8:3-23:7 + 12:5 + 2:11
=-70

(2÷3÷7+4÷6÷14+14÷21÷49)÷(4÷7÷9+8÷14÷18+28÷49÷63)=?
Why are some equal to 1.5 and some equal to 2 / 3? Which answer is right?

1.5 is the right (2 7 △ 9

What is the square of 5 (1-x) = 3.2 x

The square of 5 (1-x) = 3.2
The square of (1-x) = 0.64
x-1=±0.8
x1=1.8 x2=0.2

When a takes what value, the value of a & # - 2A + 2 is greater than 1

Solution
a²-2a+2
=(a²-2a+1)+1
=(a-1)²+1
≥1
When a ≠ 1, a & # 178; - 2A + 2 > 1