If 3a-2b + C = - 2, 2a-b + C = - 1, a + B + C = 2, then a = (), B = (), C = ()

If 3a-2b + C = - 2, 2a-b + C = - 1, a + B + C = 2, then a = (), B = (), C = ()

3a-2b + C = - 2 gives C = - 2-3a + 2B
Substituting 2a-b + C = - 1, we get b = a + 1
Substituting a + B + C = 2 to get a = 1, then C = - 1, B = 2

Given a = a3-2a2b + AB2, B = 3a2b + 2ab2-a2, and a = 2B + C, find C

∵A=a3-2a2b+ab2，B=3a2b+2ab2-a2，A=2B+C，∴C=A-2B=（a3-2a2b+ab2）-2（3a2b+2ab2-a2）=a3-2a2b+ab2-6a2b-4ab2+2a2=a3-8a2b-3ab2+2a2．

Given a = 2 square of the unknown - 3 unknown y, B = 2 square of the unknown + unknown Y-3 square of the unknown y, find 3a-2b

Let X be the unknown number, then a = 2x-3xy, B = 2x + xy-3xy  3a-2b = 3 × (2x-3xy) - 2 × (2x + xy-3xy) = 6x-9xy-4x-2xy + 6xy = 2x-11xy + 6xy

Is it necessary for X to tend to 0 when Equivalent Infinitesimal Substitution?

No, it's just that the algebraic formula tends to be infinitesimal

6 is 8 () 5 / 9 of a is 15, a is () () 2 / 7 is 6 / 7, () is 3 times of 7 / 13

6 is 8 (3 / 4), 5 / 9 of a is 15, a is (27) (3), 2 / 7 is 6 / 7, 21 / 13 is 3 times of 7 / 13

The second question of P18 application development: observe the number of the following three lines
① -2、4、-8、16、-32、64、…
② 0、6、-6、18、-30、66、…
③ -1、2、-4、8、-16、32、…
(2) What is the relationship between the number of lines 2 and 3 and the number of lines 1?
(3) Take the 10th of each row and calculate the sum of the three numbers

2. Add 2 to the number in the first line, and that's the number in the second line
Use the first line of the first two, is the third line
3、10*2=20
20-2=18
20/2=10
20+18+10=48
A: the sum of the three numbers is 48

If the resultant force is f, then ()
A. F 1 and F 2 increase 10N at the same time, f also increases 10nc. F 1 increases 10N, F 2 decreases 10N, f must remain unchanged. D. if one of F 1 and F 2 increases, f must increase

A. According to the parallelogram rule, F1 and F2 double at the same time, and f doubles, so a is correct, B, F1 and F2 increase 10N at the same time. According to the parallelogram rule, after synthesis, the increase of resultant force is not necessarily 10N, so B is wrong, C and F1 increase 10N, F2 decrease 10N, and f changes, so C is wrong, D, F1, F2

How much less is the reciprocal of three fourths than twice itself

3 / 4x2-4 / 3 = one sixth less than 1 / 6

And the ancient and modern meanings of Tang in Japan and China

Tang Guyi: hot water
It's a non-staple food with a lot of juice after cooking
When it's sunny at noon, the temperature is like hot water

For a two digit number, the number on the one digit is even and prime, and the number on the ten digit number is odd and composite. This two digit number is prime______ ．

According to the definition of prime number and composite number, even number and odd number, in 0-9, prime even number is 2, odd composite number is 9, so this two digit number is 92