A produces x parts every day, and B produces y parts every day.

Therefore, the number of parts in this batch =6x=4y.

y=3x/2

Because two people cooperated to make 120 parts in two days,

Therefore, 2(x+y)= 120.

That is 2x+2y= 120.

2x+3x= 120

x=24

y=36

So the number of this batch of parts =6*24= 144.

five

1 1=5 +6, 13= 1 1+2

19= 13+6,22= 19+3

28=22+6,32=28+4

38=32+6,43=38+5

1 2 3 5 9 ? ? 1 1 ? It means there is a problem, no.

3*2* 1=6

720-027=693

5*4*3*2* 1= 120

4*5*4*3*2* 1=480

8 species

5*3= 15 species

The canteen cooked two kinds of meat dishes, five kinds of stir-fry and three kinds of soup today. How many different choices are there for a dish?

Choose or not choose? Optional 10; If you choose one, 2*5*3=30.

3*4*2=24 species

55

522 1

52 1 1 1

5 1 1 1 1 1

22 1 1 1 1 1 1

2 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1

1 * * * 7 species

First of all, these are all going to get off work