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问答库
①49÷[45-(15+13)],
=49÷[45-15-13],
=49÷(35-13),
=49÷415,
=53;
②13+3-(14+112),
=13+3-13,
=3;
③3×(215+112)-25,
=3×215+3×112-25,
=25+14-25,
=14;
④34×57×43-12,
=34×43×57-12,
=57-12,
=314;
⑤1516+(716-14)÷12,
=1516+316÷12,
=1516+616,
=2116;
⑥23-89×38÷127,
=23-9,
=14;
⑦(13-14)÷12+56,
=112÷12+56,
=16+56,
=1;
⑧12×3+12÷15,
=12×(3+5),
=12×8,
=4;
⑨23+(47+12)×725,
=23+1514×725,
=23+310,
=2930;
⑩8×56+25÷4,
=203+110,
=20330.