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15÷(1-13×12)=910×[78÷(45+14)]=(14-14×12)÷14=56
问题详情
参考答案
(1)15÷(1-13×12),
=15÷(1-16),
=15÷56,
=625;
(2)910×[78÷(45+14)],
=910×[78÷2120],
=910×56,
=34;
(3)(14-14×12)÷14,
=14×(1-12)÷14,
=14×12÷14,
=14÷14×12,
=1×12,
=12;
(4)56+98×59×89,
=56+98×89×59,
=56+59,
=2518;
(5)9×56+56÷19,
=9×56+56×9,
=56×(9+9),
=56×18,
=15;
(6)(38+127)×8+1927,
=38×8+127×8+1927,
=3+827+1927,
=3+(827+1927),
=3+1,
=4;
(7)X-13X=23,
23X=23,
23X÷23=23÷23
X=1;
(8)1-13X=23,
1-13X+13X=23+13X,
23+13X=1,
23+13X-23=1-23,
13X=13,
13X÷13=13÷13,
X=1;
(9)8X+13=79,
8X+13-13=79-13,
8X=49,
8X÷8=49÷8,
X=118;
(10)1544:X=511,
1544÷X=511,
1544÷X×X=511×X,
511×X=1544,
511×X÷511=1544÷511,
X=34.
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