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(1)×34=23.
答:是23.
(2)24×13-24×14,
=8-6,
=2.
答:多2.
(3)(13-14)+13×14,
=112+112,
=16.
答:和是16.
(4)(9+1÷9)×79,
=(9+19)×79,
=9×79+19×79,
=7+781,
=7781.
答:积是7781.