Question

80 БАЛООВ

СРОЧНОООО

1)16-m^2=

8c^2-64=


2)(3b^2-7a)(3b^2+7a)=

(3ab-2)(2+3ab)=


3) 53^2-27^2/79^2-51^2=

300^2-100^2/140^2-60^2=

Answer 1

1)16-m²=(4-m)*(4+m)

8c²-64=8(с-2√2)(с+2√2)

2)(3b²-7a)(3b²+7a)=9b⁴-49a²

(3ab-2)(2+3ab)=9a²b²-4

3) 53²-27²/79²-51²=(53-51)(53+51)-(27/79)²=2*104-729/6241=

(1298128-729)/6241=1297399/6241=207  5512/6241

300²-100²/140²-60²=(300-60)(300+60) -(100/140)²=240*360-(5/7)²=

86400-25/49=(4233600-25)/49=4233575/49=86399  24/49