Tính:
1 + 6 + 9 + 4 + 12 + 68 - 10
= [ ( 1 + 9 ) - 10 ] + ( 6 + 4 ) + ( 12 + 68 )
= 0 + 10 + 80
= 90
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=7+9+4+12+68-10
=16+4+12+68-10
=20+12+68-10
=32+68-10
=100-10
=90
1+6+9+4+12+68-10
(1+9)+(6+4)+(12+68)-10
10+10+80-10
100-10
90
1+6+9+4+12+68-10=
(1+9)+(6+4)+(12+68)-10=
10+10+80-10=90
1+ 6 + 9 + 4 + 12 + 68 - 10
= ( 1 + 9 ) + ( 6 + 4 ) + ( 12 + 68 ) - 10
= 10 + 10 + 100 - 10
= 20 + 100 - 10
= 120 - 10
= 110