How many minutes is two-thirds of an hour?
60 minutes an hour, 2 / 3 is 60 / 3 * 2 = 40 minutes!
Calculate 11 × 2 + 12 × 3 + 13 × 4 + +198×99+199×100.
The original formula = (11-12) + (12-13) + (13-14) + (198-199) + (199-1100) = 11-12 + 12-13 + 13-14 + 198-199 + 199-1100 = 1-1100 = 99100
If the polynomial (R's Square-1) x's square + (R-1) X-1 about X is a binomial of degree, find R
(R ^ 2-1) x ^ 2 + (R-1) X-1 is a binomial,
And R-1 ≠ 0. R = - 1
The current price of a TV set is 1200 yuan, which is 20% lower than the original price. How much is the original price of this TV set?
1200 + 1200 * 20% = 1200 + 240 = 1440 yuan
The side area of a cylinder is 188.4dm2, and its bottom radius is 2DM. What is its height?
188.4 ÷ (2 × 3.14 × 2) = 188.4 ÷ 12.56 = 15 (decimeter) a: its height is 15 decimeters
How to get the absolute value sign
|How to use this formula
|x-y-1|=2
X-y-1 > 0, the original formula x-y-1 = 2, x-y-3 = 0
x-y-1
If √ 56.7 = a, √ 567 = B, then √ 5.67=____
do somebody a favour
√5.67=√(567×0.01)=b×0.1=0.1b
Two fifths of what is eight fifths of what; two ninths of what is eight thirds of what
X x 2/5=8/15
The solution is x = 4 / 3
That is, two fifths of Four Thirds is eight fifths
2/9÷3/8=16/27
That is, two out of nine is 16 out of 27 out of eight out of three
General score: 3AB & # 178; 2% and 2A & # 178; BC: a + B;
The simplest common denominator of 3AB & # 178; and 2A & # 178; BC is 6A & # 178; B & # 178; C
Therefore, 2 / 3 of 3AB and 178 = 4ac / (6a and 178; B and 178; c)
A + B = 3B / (6a & # 178; B & # 178; c)
4.2-1.38 + 5.8-3.62 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 16 ÷ [1 ÷ (35-310)] 2 ÷ 23-23 ÷ 2 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 35 × 99 + 35
(1)4.2-1.38+5.8-3.62 =(4.2+5.8)-(1.38+3.62),=10-5,=5;(2)16÷[1÷(35-310)]=16÷[1÷310],=16÷103,=120;(3)2÷23-23÷2 =3-13,=223.(4)35×99+35=(99+1)×35,=100×35,=60.