Factorization (2x-1) 3-x3,3 is cubic,

Factorization (2x-1) 3-x3,3 is cubic,

(2x-1)3-x3
=(2x-1-x)((2x-1)²+x(2x-1)+x²)
=(x-1)(4x²-4x+1+2x²-x+x²)
=(x-1)(7x²-5x+1)
formula
a^3-b^3=(a-b)(a²+ab+b²)

Factorization x4-6x & # 178; + 25

x4-6x²+25
=(x^4+10x²+25)-16x²
=(x²+5)²-(4x)²
=(x²-4x+5)(x²+4x+5)

Simple calculation of 79 times 42 plus 79 plus 79 times 57

The simple operation of 79 + 31 / 42 + 79,

There seems to be no simple calculation for this child

How to do 79 * 42 + 79 + 79 * 57

79*42+79+79*57
=79*（42+1+57）
=79*100
=7900

Simple calculation of 3.21 * 5.301 + 5.79 * 5.301 + 5.301

3.21*5.301+5.79*5.301+5.301
=5.301*(3.21+5.79+1)
=5.301*10
=53.01

A simple calculation for 738-301

738-301
=738-（300+1）
=738-300-1
=438-1
=437

301 + 297 simple operation

301+297
=300+297+1
=597+1
=598

12 * 301 simple operation

12X（300+1）=3600+12=3612

1) 2x-1 = 3x (2) 2x-3 = 3x divided by 2 (3) 2x-3 (2-2x) = 15 (4) X-7 = 10-3 (x + 1)
(5) 2 x + 5-3 2x + 1 = 1 (6) 0.2 x + 0.5 = + 0.3 x + 1 = 2

1) 2x-1 = 3xx-2 = 6xx = - 2 / 5 (2) 2x-3 = 3x divided by 24x-6 = 3xx = 6 (3) 2x-3 (2-2x) = 15 2x-6 + 6x = 158x = 21x = 21 / 8 (4) X-7 = 10-3 (x + 1) X-7 = 10-3x-34x = 14x = 7 / 2 (5) 2x + 1 = 13 (x + 5) - 2 (2x + 1) = 63x + 15-4x-2 = 6x = 7 (6) 0.2