oblicz sprytnie a)143 do kwadratu - 43do kwadratu
b)1959 do kwadratu - 41 do kwadratu
c)1003 * 997
d)302 * 298
e)49 do kwadratu - 41 do kwadratu / 54 do kwadratu - 46 do kwadratu
f) 66 do kwadratu - 54 do kwadratu / 75 do kwadratu - 45 do kwadratu
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a) (143^2-43^2)=(143-43)(143+43)=100*186=18600
b) (1959-41)(1959+41)=2000*1918= 3836000
c)(1000+3)(1000-3)=1000^2-3^2=1000000-9= 999991
d)(300+2)(300-2)= 300^2-2^2=90000-4=89996
e)(49+41)(49-41):(54-46)(54+46)=(100*8):(100*8)=8/8=1
f)(66+54)(66-54):(75-45)(75+45)=120*12:120*30= 0,4
a) (143²-43²)=(143-43)(143+43)=100*186=18600
b) (1959-41)(1959+41)=2000*1918= 3836000
c)(1000+3)(1000-3)=1000²-3²=1000000-9= 999991
d)(300+2)(300-2)= 300²-2²=90000-4=89996
e)(49+41)(49-41):(54-46)(54+46)=(90*8):(100*8)=0,9
f)(66+54)(66-54):(75-45)(75+45)=120*12:120*30= 0,4
Wystarczyło wykorzystać wzory skróconego mnożenia:)