How much is the first question on page 1 14 of the second volume of the seventh grade math book?

How much is the first question on page 1 14 of the second volume of the seventh grade math book? x=5

y=-2

z=3\ 1

One hundred percent correct

The third question on page 133 of the second volume of the seventh grade math book numbers the inequalities in the inequality group.

(1) Solving inequality (1): x > -1, solving inequality ②: x

The solution set of inequality group is:-1

(2) Solving inequality ①: x

The solution set of the inequality group is 3.

(3) Solving inequality ①: x

The solution set of the inequality group is: x < -3/2,

(4) The result of solving inequality ① is: X≤ 1, and the result of solving inequality ② is: X>4,

There is no solution to the unequal system.

The third question on page 93 of the second volume of the seventh grade math book is suggested to be posted later, otherwise it is impossible to get the answer as it is now.

The second sub-topic 3y-2z = 1 of the seventh grade math book1page.

So 3y= 1+2z, substitute 4x+9y= 12.

So 4x+9y = 12.

=4x+3*( 1+2z)= 12

=4x+6z=9

Solving binary linear equations

Get z=2.

X =- three quarters

So y = 15 in 9.

The answer to the question 15 on page 38 of the second volume of the seventh grade mathematics textbook is because of PQRS.

So ∠QBC=∠SCB (two straight lines are parallel

Equal)

So ∠ CBN = 90-∠ QBC = 90-∠ SCB = MCB.

Because BN shares ∠ABC, CM shares ∠BCD.

So ∠ABC=∠BCD (equivalent substitution)

So CDAB (

Equal, two straight lines are parallel)

The number of math books in the second volume of the seventh grade, 80 pages, 10, can you give me a question?

The answer to the sixth question on page 102 of the second volume of the seventh grade math book. I am a master of mathematics, you can ask me questions at any time!

You can send me a message or a private letter directly, which will definitely help you solve it, especially if others can't. At present, it has been answered by private letter to satisfy the questioner!

The answer to the third question on page 1 18 of the second volume of the seventh grade math book is 1. Solution: The equation is sorted out.

4x-y=5 ①

3x+2y= 12 ②

①*2+②, get

1 1x=22

solve

x=2

Substitute x=2 into ①, and you get

y=3

So the solution of the equation is x=2.

y=3

2. Solution: The equation is sorted out.

5x- 1 1y=- 12 ①

-2x+ 10y= 16 ②

①*2+②*5, get

28y=56

The solution is y=2.

Substitute y=2 into ①, and you get

x=2

So the solution of the equation is x=2.

y=2

The fifth question on page 1 18 of the second volume of the seventh grade math book/warehouse kloc-0/and warehouse 2 * * store 450 tons of grain. Now warehouse 1 stores 60% of grain, and warehouse 2 stores 40% of grain. As a result, the grain left in warehouse 2 is 30 tons more than that in warehouse 1. How many tons of grain were originally stored in warehouses 1 and 2?

Warehouse 1 original 240 tons, warehouse 2 10 tons. The calculation method is binary equation, x+y = 450, x (1-0.6)-y (1-0.4) =-30.

The second sub-item 2x/3+3y/4 = 1/5 ① on page 65438 of the second volume of seventh grade mathematics.

5x/6-5y/2=2 ②

(1) Also use *60 on both sides.

40x+45y= 12 ③

② Both sides of the formula are * 18, so.

15x-45y=36 ④

③+④

40x+ 15x= 12+36

55x=48

x=48/55

Substitution ④