a ) 128 . ( 278 - 302 ) + 278 . ( 302 - 128 )
= 128 . 278 - 128 . 302 + 278 . 302 - 128 . 278
= ( 128 . 278 - 128 . 278 ) + ( 278 . 302 - 128 . 302 )
= 302 . ( 278 - 128 )
= 302 . 100 = 30200 .
b ) 2 . ( - 7 )2 - 3 . ( - 4 )3 - 60
= 2 . 49 + 192 - 60
= 98 + 192 - 60
= 230 .
128.(278-302)+278.(302-128)
= 128.278 - 302.128 + 278 .302 -128.278
= 302( 278-128) - 128( 278-278)
= 302 . 150 - 0
= 45300
2. ( -7)2+ 3.(-4)3 - 60
= 2. 49 + 3. ( -64) -60
= 98 + ( -192) -60
= -94 -60
=-154
128.(278-302)+278.(302-128)
= 128.(-24)+278.174
=-3072+48372
=45300
2.(-7)2+3.(-4)3-60
=2.49+3.(-64)-60
=98+(-192)-60
=-94-60
=-154