Вычислите 1) 2,1*1,9 2) 4,02*3,98 3) 19,8*20,2 - вопрос №12119240239831982024105095532323305500 от Happyunicorn28 06.04.2020 10:21

Question

Алгебра: Вычислите 1) 2,1*1,9 2) 4,02*3,98 3) 19,8*20,2 4) 1,05*0,95 5) (3 2/3)^2-(2 1/3)^2 6) (4 1/6)^2-(1 1/6)^2

Happyunicorn28 · Answer

1) 2.1*1.9=3.992) 4.02*3.98=15.99963) 19.8*20.2=399.964) 1.05*0.95=0.99755) (3*2/3)^2-(2*1/3)^2=(11/3)^2-(7/3)^2=121/9-49/9=72/9=86) (4*1/3)^2-(1*1/6)^2=(25/6)^2-(7/6)^2=625/36-49/36=576/36=16...