7 out of 9 times 52 plus 2 out of 9 times 51

7 out of 9 times 52 plus 2 out of 9 times 51

=7/9×(51+1)+2/9×51
=7/9×51+7/9×1+2/9×51
=(7/9+2/9)×51+7/9
=1×51+7/9
=51 and 7 / 9

If (x + 1) ³ = 0.008, then what is x equal to? If (x + 1) ² = 0.04, then what is x equal to

The first negative 0.8, the second negative 0.8 or negative 1.2

Which drink is the cheapest 3 yuan 2 Bottles 4 yuan 3 bottles 8 yuan 5 bottles

2 △ 3 = 1.5 yuan
3 △ 4 = 0.75 yuan
5 △ 8 = 0.625 yuan
The third is cheap

(M + n) ^ 2-8 (m ^ 2-N ^ 2) + 16 (m-n) ^ 2 = factorize

(m+n)^2-8(m^2-n^2)+16(m-n)^2
=（m+n）^2-2×4（m-n）（m+n）+[4(m-n)]^2
=[(m+n)-4(m-n)]^2
=(m+n-4m+4n)^2
=（-3m+5n）^2
=(5n-3m)^2

How to do three fourths times (3-13 / 5 minus 8 / 13)

3/2

After sawing a 2-meter-long cuboid timber into two sections, the surface area increases by 50 square decimeters. What is the volume of this timber in cubic meters

The increased surface area is the size of the two bottom areas;
So:
Bottom area = 50 △ 2 = 25 square decimeter = 0.25 square meter
Wood volume
=2×0.25
=0.5 M3

A six digit number 23 □ 56 □ is a multiple of 88. The quotient of this number divided by 88 is______ Or______ ．

If a number is a multiple of 88, the number must be a multiple of both 8 and 11. According to the multiple of 8, its last three digits must also be a multiple of 8, so we can know that the number on the single digit of the six digit is 0 or 8; according to the multiple of 11, the difference between the sum of the odd and even digits should be a multiple of 0 or 11

10y-2(7y-2)=5(4y+5)-3y

10y-2(7y-2)=5(4y+5)-3y
10y-14y+4=20y+25-3y
10y-14y-20y+3y=25-4
-21y=21
y=-21/21
y=-1

Find the rule 3, 6, 11, 18, 27... The nth number is___

The nth number is n ^ 2 + 2

(6a & # 178; - 2A & # 178;) - (- A & # 178; + 2Ab + B & # 178;) - (A & # 178; - 4AB + 3B & # 178;) simplification

(6a²-2b²)-(-a²+2ab+b²)-(a²-4ab+3b²)
=6a²-2b²+a²-2ab-b²-a²+4ab-3b²
=(6+1-1)a²-(2+1+3)b²+(4-2)ab
=6a²-6b²+2ab