How to do housework

How to do housework

yesterday,My do chores at home.first ,I wash the dishes .then,i feed the fish.then ,i polish my shoes,i will tired

The ratio of length to width of a rectangle is 14:5. If the length decreases by 13cm and the width increases by 13cm, the area increases by 182

Judge right or wrong?
Suppose the length and width are 14 and 5
14×5=70
（14-13）×（5+13）=18
Not only did it not increase, but it also increased or decreased, so this proposition is wrong

Given the set a = {(x, y) | 0 ≤ x ≤ 1, y = 0}, B = {(x, y) | y = x + a}, what is the range of real numbers satisfying a ∩ B = & # 8709?

a> O or a

1、 Given the algebraic formula X & sup2; + MX + N, when x = 3, the value of the algebraic formula is 5; when x = - 4, the value of the algebraic formula is - 9 (1)

It can be seen from the meaning of the title: 9 + 3M + n = 5
16-4m+n=-1
m=13/7
n=-67/7

The function f (x) = | X-1 | + | x-a |. If ∀ x ∈ R, f (x) ≥ 2, the value range of a is______ ．

Let ∀ x 8704\∀ x 8704∀ x 8704∀ x 8704; x ∀ x ∀ x 8704∀ R, f (x) \\124; X-1 | 124\\\\\\\\\\\\\\\\\\\\\\\\\\\\[3, + ∞)

Given that a = 2A squared-9b, B = - 5A squared + 4b, find the value of 2a-3b

A = 2A & # 178; - 9b, B = - 5A & # 178; + 4b, so
2A-3B=2（2a²-9b）-3（-5a²+4b）=4a²+15a ²-18b-12b=19a²-30b

The words "220 V & nbsp; & nbsp; 40 W" are marked on the incandescent lamp, indicating that the current passing through the filament is zero when the lamp is normally emitting______ A. The resistance of the filament is______ Ω．

When incandescent lamp works normally, the voltage is 220 V and the power is 40 W, which can be obtained by P = UI. At this time, the current through filament: I = Pu = 40 W, 220 V = 211A ≈ 0.18 a, which can be obtained by I = ur, and the resistance of bulb: r = UI = 220 V, 211A = 1210 Ω

Cauchy's mean value theorem condition two function derivatives are not zero at the same time why?

From the formal point of view, this condition is indeed dispensable, but it is a trivial case that f 'and G' can take zero at the same time. The conclusion at this time has no value of the general mean value theorem, so it is not bad to emphasize the non trivial case
If the conclusion is written in fractional form, then as the first floor said, there should be the condition that the denominator is not zero

The name plate of an electrical appliance is marked with 220 V 750 W. the rated power of this electrical appliance is

It's 220 v

If the system of equations 5x + 6y = 16 has infinite solutions, then the system of equations 4x + 5Y = 7,10mx + 7
=The solution of 11 is

{x=38,y=-29,m=1/95}