Given that x = 3 is the solution of equation 2 [(x / 3 + 1) + m (x-1) / 4] = 3, and N satisfies the absolute value of the relation m + 2n = 1, find the value of M + n

Given that x = 3 is the solution of equation 2 [(x / 3 + 1) + m (x-1) / 4] = 3, and N satisfies the absolute value of the relation m + 2n = 1, find the value of M + n

X = 3 is the solution of equation 2 [(x / 3 + 1) + m (x-1) / 4] = 3
2[(3/3+1)+m(3-1)/4]=3
2[2+m/2]=3
4+m=3
m=-1
And N satisfies the absolute value of the relation m + 2n = 1
|m+2n|=1
|-1+2n|=1
-1+2n=1 n=1
Or - 1 + 2n = - 1, n = 0
m+n=-1+1=0
Or M + n = - 1 + 0 = - 1

It is known that x = 3 is the solution n of equation 3 [(x + 1 / 3) + m (x-1 / 4)] equal to 2, which satisfies the relation that the absolute value of 2n + m is equal to 1 and the value of n is obtained

Substituting x into M = - 8 / 3, that is, the absolute value of 2n-8 / 3 is equal to 1, and the solution is n = 11 / 6 or 5 / 6

Given that x = 3 is the solution of the equation x + 3 / 3 + m (x-1) = 3, n satisfies the relation 2n + m with absolute value = 4010, try to find the value of M + n

x=3
Then (3 + 3) / 3 + m (3-1) = 3
2+2m=3
m=1/2
|2n+m|=4010
2n+m=±4010
2n=-8021/2,2n=8019/2
n=-8021/4,n=8019/4
So m + n = - 8019 / 4, M + n = 8021 / 4

For a project, it takes 19 hours for Party A to do it alone and 16 hours for Party B to do it alone. If the two teams cooperate, the efficiency of Party A will be reduced by 5%, and that of Party B will be reduced by 8%,
If the project is required to be completed in 10 days, how many days will the two teams cooperate at least
Do 8.5, don't know right

A efficiency of 1 / 19x (1-5%) = 1 / 20 b efficiency of 1 / 16x (1-8%) = 1 / 16x23 / 25 = 23 / 400 set cooperation X days X / 20 + 23x / 400 = 1 - (10-x) / 1643x / 400 = 1-5 / 8 + X / 1643x / 400-25x / 400 = 3 / 89x / 200 = 3 / 8x = 3 / 8 △ 9 / 200X = 25 / 3 answer cooperation 25 / 3 days

7 and 2 / 5 cubic decimeter = how many liters = how many milliliters

7 and 2 / 5 cubic decimeter = 7.4 liter = 7400 ml

People's education press seventh grade volume II English unit 3 knowledge points

Every unit has a "grammar focus", which is about the main sentence patterns of this unit

There are 8 white balls, 7 red balls and 5 yellow balls in the bag, so that there are at least 4 balls of the same color and at least 3 balls of another color in the bag
At least take a few balls out of your pocket? Help an expert!

Up to 13 balls have to be taken out

3 hectares 80 square meters = how many hectares = how many square meters

Edit an introduction to this paragraph
Hectare (g ō ngq ǐ ng, hectare (HA)) is a metric unit of area. The letter indicates that hectare is the metric unit of area (International Unit). A piece of land with an area of one hectare is approximately similar to a standard football field
Edit the unit symbol of this paragraph
The unit symbol of hectare is "hm2" (where 2 is superscript), where h is 100 meters. Hm2 means square hectometer of 100 meters, that is 10000 square meters, that is 1 hectare. In addition, hectare can also be expressed as ha, Ha is the abbreviation of hectare. HA is not recommended in China. There are three land area units in China: square meter (M2), hectare (hm2) and square kilometer (km2)
Edit area conversion in this section
Metric system 1 square centimeter = 100 square millimeter = 0.1550 square inch 1 square meter = 10000 square centimeter = 1.1960 square yard 1 hectare = 15 mu = 10000 square meter 1 mu = 666.67 square meter 1 hectare = 10000 square meter = 2.4711 acre 1 square kilometer = 100 hectare = 0.3861 square mile British system 1 square inch = 6.4516 square centimeter 1 square foot = 144 Square inches = 9.29 square decimeters 1 square yard = 9 square feet = 0.8361 square meters 1 acre = 4840 square yards = 4046.86 square meters 1 square mile = 640 acres = 259.0 hectares
Edit volume conversion in this section
Metric system 1 cubic centimeter = 0.061 cubic inch 1 cubic decimeter = 1000 cubic centimeter = 0.0610 cubic inch 1 cubic meter = 1000 cubic decimeter = 0.353 cubic foot 1 cubic meter = 1000 cubic decimeter = 1.3079 cubic yards, British system 1 cubic inch = 16.387 cubic centimeter 1 cubic foot = 28.3 cubic decimeter 1 cubic yard = 27 cubic feet = 0.7646 cubic meters
= 3.008 ha = 30080 M2

There is a trapezoid. If the upper bottom is increased by 2 meters, the lower bottom and height will not change. Its area will increase by 4.8 square meters. If the upper bottom and the lower bottom are both unchanged, and the height is increased by 2 meters, its area will increase by 8.5 square meters. Find the area of the original trapezoid

Height of trapezoid: 2 × 4.8 △ 2 = 4.8 (m) sum of top and bottom of trapezoid: 2 × 8.5 △ 2 = 8.5 (m) area of original trapezoid: 4.8 × 8.5 △ 2 = 20.4 (M2) answer: area of original trapezoid is 20.4 square meters

How to calculate 7.5 * 2.3 + 2.9 * 2.5 + 12.5 * 0.4?

=2.5x6.9+2.9x2.5+2.5x2
=2.5x（6.9+2.9+2)
=2.5x11.8
=2.5x2x5.9
=29.5