A-A+
脱式计算.(能简算的要简算)19÷(13-19)89×[34-(716-14)]58÷[21
问题详情
参考答案
(1)19÷(13-19)
=19÷29,
=12;
(2)89×[34-(716-14)]
=89×[34+14-716],
=89×[1-716],
=89×916,
=12;
(3)58÷[211×(15+16)]
=58÷[211×1130],
=58×15,
=938;
(4)79÷115+29×511
=79×511+29×511,
=(79+29)×511,
=1×511,
=511;
(5)5.58-35+5.42-25
=(5.58+5.42)-(35+25),
=11-1,
=10;
(6)99989+9989+989+13.
=1000+100+10+13-19-19-19,
=1110+(13-19×3),
=1110+(13-13).
=1110+0,
=1110.
考点: