45 times 24 plus 76 times 45 is a simple method

45 times 24 plus 76 times 45 is a simple method

45 times 24 plus 76 times 45
=45（24+76
=45*100
=4500

Number table 1 2 3 4 5 6 7.3 5 7 9 11 13.8 12 16 20 24. The 10th number in the 13th row is?

According to the meaning of the question, we can find a = 2 ^ (n-1) + (n-1) * 2 ^ (n-2) of the first number in no row, and each row is an arithmetic sequence, and the tolerance is 2 ^ (n-1). Note: n is the number of rows. Therefore, the 10th number in the 13th row is 2 ^ 12 + 12 * 2 ^ 11 + 12 * 2 ^ 12 = 19 * 2 ^ 12 = 77824

24 questions (12 6 4 5) (4 8 10 13)

1:(12 × (6 + 4)) ÷ 52:12 × (6 + 4) ÷ 53:12 × ((6 + 4) ÷ 5)4:12 ÷ 5 ×(6 + 4)5:(12 ÷ 5) × (6 + 4)6:12 ÷ (5 ÷ (6 + 4))7:12 ÷ 5 ×(4 + 6)8:(12 ÷ 5) × (4 + 6)9:12 ÷ (5 ÷ (4 + 6))10:(12 × ...

Simple calculation of 6.45 + (3.55-2.9)
y

6.45+(3.55-2.9)
=6.45+3.55-2.9
=10-2.9
=7.1

How to calculate 2.55 times 1.5 times 1 plus 6.45 times 1.5 (simple operation)

=1.5×（2.55+6.45）
=1.5×9
=13.5

How to calculate 2.5 + 5.55-1.59 + 4.45 simply

5.55 + 4.45 + (2.5-1.59) direct oral calculation can come out

1: 1 and 1 / 18 reduction ratio

1: 1 and 1 / 18 reduction ratio = 1: (19 / 18) = 18:19

3 / 18 to 0.5

1：3

3 / 5: 0.18

3/5:0.18=60:18=10:3

3 out of 10 to 5 out of 18, simplification ratio. To write a detailed simplification process, we can't have only one step
Urgent, urgent, urgent, hope to be quick

10 / 3:18 / 5 = (10 / 3 * 90): (18 / 5 * 90) = 27:25