Realiza las operaciones mentalmente, sin utilizar lápiz ni papel.
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(38-15)x4=
(9x6)-32=
(63-45)x4=
(8x10)-7=
8x(10-7)=
(7-2)x(9-4)=
(6x9)-22=
30x(15-6)=
(134-42)x100=
(57-28)x2=
(359-160)x3=
(9x5)-11-3=
(7x11)-13=
(5x4)-7=
(202-120)x2=
36-(3x6)=
71-(4x8)=
(12x4)-16=
55-(7x3)=
(105x100)-100=