Пошаговое объяснение:
1) - = (38-28)(38+28)=10*66=660
2)- =(74-26)(74+26)=48*100=4800
3)-=(54-44)(54+44)=10*98=980
4)- = (165-65)(165+65)=100*230=23000
5)- = (248-152)(248+152)=96*400=96*100*4=9600*4=38400
6) - =(74.6-24.4)(74.6+24.4)=50.2*99=50.2*100-50.2=5020-50.2=4969.8
7)- = (42.4-42.3)(42.4+42.3)=0.1*84.7=8.47
8) - = (8 - 1)(8 + 1)=(-)(+) = *===75
Пошаговое объяснение:
1)
-
= (38-28)(38+28)=10*66=660
2)
-
=(74-26)(74+26)=48*100=4800
3)
-
=(54-44)(54+44)=10*98=980
4)
-
= (165-65)(165+65)=100*230=23000
5)
-
= (248-152)(248+152)=96*400=96*100*4=9600*4=38400
6)
-
=(74.6-24.4)(74.6+24.4)=50.2*99=50.2*100-50.2=5020-50.2=4969.8
7)
-
= (42.4-42.3)(42.4+42.3)=0.1*84.7=8.47
8)
-
= (8
- 1
)(8
+ 1
)=(
-
)(
+
) =
*
=
=
=75