He often helps his mother with the housework

He often helps his mother with the housework

he often helps his mother do housework

I can help my mother with the housework

I can help my mother to do some housework.
I can help my mother do some housework.
I can help my mother with housework.
There are three different usages of help
Hope to adopt it

I want to help my mother do housework

I helped my mother do housework

Simple calculation of 35 × (3 / 5 + 5 / 7-7 / 35)

35×（3/5+5/7-7/35)
=35*(3/5)+35*(5/7)-35*(7/35)
=21+25-7
=21+18
=39

Let the symmetric point of P [2m-3.3m-2] about the axis be in the second quadrant

If the point P is in the first quadrant, then: 2m-3 > 0 and 3m-2 > 0; if in the third quadrant, then: 2m-3

Half, quarter, eighth, sixteenth, = 8

（1/2）/ (1/4-(1/8+1/16))=8

How to solve several mathematics problems in Senior One: 1. Monotonicity of function f (x) = x / √ (1-x & # 178;)
A. Monotonically increasing on (- 1,1) B. monotonically increasing on (- 1,0) and monotonically decreasing on (0,1)
C. Monotonically decreasing on (- 1,1) d. monotonically decreasing on (- 1,0) and monotonically increasing on (0,1)
The answer is a
2. Let f (x) = a ^ X / (1 + A ^ x) (a > 0, a ≠ 1), [M] denote the largest integer not exceeding the real number m, then the range of function g (x) = [f (x) - 1 / 2] + [f (- x) - 1 / 2] is______ .
The answer is {0, - 1}

(1)
Let x = sin θ (- π / 2)

Divide the scores: 2 / 5 and 3 / 8, 11 / 12 and 16 / 5, 5 / 9 and 7 / 12, 1 / 7 and 6 / 21

16 / 40 and 15 / 40 44 / 48 and 15 / 48 20 / 36 and 21 / 36 3 / 21 and 6 / 21 27 / 30 and 4 / 30

What is the derivative of the X / 2 power of E

The X / 2 power of E is multiplied by one-half

The number of class six (1) is one ninth more than class six (2), and class six (2) is four less than class six (1). How many people are there in each class?

40 36