Calculation of 642 * 358 / 372 / 385 * 372 with simple method Speed! There are still many questions to search!

642 * 358 / 372 / 385 * 372 direct reduction
=642

How to do 45 * 101-45

=45*（101-1）
=45*100
=4500

The greatest common factor of 18 and 72 is the process!

18: 1,2,3,6,9,18
72: 1,2,3,4,6,8,9,12,18,24
36,72
（18,72）=18

The greatest common divisor of 34 and 51 is ; & nbsp; & nbsp; the least common multiple of 12, 16, 24 is ．

① 34 = 2 × 17, 51 = 3 × 17, so the greatest common divisor of 34 and 51 is: 17; ② 12 = 2 × 2 × 3, 16 = 2 × 2 × 2 × 2, 24 = 2 × 2 × 2 × 3, so the least common multiple of 12, 16 and 24 is: 2 × 2 × 2 × 2 × 3 = 48, so the answer is: 17, 48

() 18 = 35 / 30 = 25 / 30 = 5 / 6

(15) 18 = 35 / 42 = 25 / 30 = 5 / 6

19 out of 18 is equal to what part is equal to () / 6?
If the numerator of a out of B is added with 2, the denominator should be () to keep the size of the fraction unchanged.
5/8+4/5-3/8+1/5？ Calculation with reasonable method

19/18+1/9=7/6;
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Nine divided by four is two and twenty-eight

9÷4-2=1/4=7/28
Nine divided by four is two and seven out of 28

31 out of 60 times (- 60) equals?

31 / 60 times (- 60) = - 31

Who can take 39.9 times how much plus 28.5 times how much plus 9.9 times how much, and finally equal 4607
Who can use (39.9 ?) +（28.5？ )+ （9.9*？） =4607

If it is more or less the same, it can be set to X,
39.9X+28.5X+9.9X=4607,783X=46070
X=46070/783

Calculation: 11 ^ 2 + 12 ^ 2 + 13 ^ 2 + +29^2

Using this formula:
1^2+2^2+3^2+… +n^2=[n(n+1)(2n+1)]/6
11^2+12^2+13^2+… +29^2
=（1^2+2^2+3^2+… +29^2）-（11^2+12^2+13^2+… +10^2）
=[29*30*59]/6-[10*11*21]/6
=8170

Calculation of 642 * 358 / 372 / 385 * 372 with simple method Speed! There are still many questions to search!