19. + 6.8-9.5 simple calculation process

19. + 6.8-9.5 simple calculation process

=19-9+6.8-0.5
=10+6.3
=16.3

640 and 10135; (16 and 10135; 4) simple method

Isn't that right? It needs to be simple? 16 divided by 4 equals 4640 divided by 4 equals 210. It's all oral

25 + 75-25 + 75 with simple method

25+75-25+75
＝25-25+75+75
＝75＋75
＝150

It turns out that 8 yuan is 2 yuan cheaper. How much is it?

8-2 = 6 yuan. You are very clever to ask this question

(-5.25)*(-4.73)-4.73*(-19.75)*25*(-5.27)

(-5.25)*(-4.73)-4.73*(-19.75)*25*(-5.27)
=5.25*4.73-4.73*19.75*25*5.27
=25*4.73*(0.21-19.75*5.27)
=118.25*(-103.8725)
=-12282.923125

There are five kinds of gifts with the price of 2 yuan, 5 yuan, 8 yuan, 11 yuan and 14 yuan respectively, and five kinds of packing boxes with the price of 1 yuan, 3 yuan, 5 yuan, 7 yuan and 9 yuan respectively______ There are two different prices

A total of 25-6 = 19 (kinds) bags & nbsp; & nbsp; & nbsp; & nbsp; in & nbsp; & nbsp; & nbsp; boxes & nbsp; & nbsp; & nbsp; price & nbsp; & nbsp; & nbsp; lattice gift box price 1 3557 9 2 3557 9 11 5 6 8 10 12 14 8 9 11 15 17 11 12 16 20 15 17 19 21 23 so the answer is: 19

Fourth grade second volume language book 27 lesson fish swim to the text content on the paper

A rooster is 3 yuan, a hen is 2 yuan, and a chick is 1 yuan. If you want to buy 100 chickens for 100 yuan, you must spend all the money. How do you buy them?

Cocks, hens, chicks
5 32 63
10 24 66
15 16 69
20 8 72
25 0 75
0 40 60

PEP 27 fish swim on paper
200 words

There were more and more onlookers. They praised and talked about it. Some said it was really beautiful, some said it was really lifelike, and some said it would be nice if it had been painted by him. A mother took her child to Huagang to watch fish. The child pointed to the young man's painting and said, "Mom, I'll learn to draw too!" Mom

There are 100 yuan to buy 100 chickens, 2 yuan for each rooster, 3 yuan for each hen and 1 yuan for each chicken. There are several ways to buy them (at least 1 chicken of each kind)
The problem of staying in class, 9958,

Because it is an integer, the number of chickens must be a multiple of 3. Suppose there are 3N chickens, X cocks and Y hens, then
2x+3y+n=100
x+y+3n=100
The two sides of the following formula multiply by two minus the above formula
5n-y=100,y=100-5n
x=2n
So 2n + 3N must be greater than 0 and less than 100, so the minimum n is 1 and the maximum n is 19
There are 19 ways to buy