Ответ:
Объяснение:
1. 3(х – 5) + 10 = 2(3 + х) – 14
3х-15+10=6+2х-14
3х-2х=6-14+15-10
х=-3
...=5abc^2/3*9b=5abc^2/3*9b=45ab^2c^2/3=15ab^2c^2
2√2 + 3 (2V2+3)(3+2V2) 9+12V2+4*2 17+12V2
₋₋₋₋₋₋₋₋₋₋₋₋ = ___________________ _____________ = ________ = 17+12V2
3- 2√2 (3-2V2)(3+2V2) 9-4*2 1
2) (0,3b³+x)*(0,3b³-x)= 9/100b⁶-x²
4) (21d²-k³)*(21d²+k³)= (21d²)²-(k³)²=441d⁴-k⁶
6) (1,9c⁴+6d)(6d-1,9c⁴)=(6d+1,9c⁴)(6d-1,9c⁴)=36d²-1,9²*c⁸=36d²-361/100c⁸