A-A+
计算下面各题 能简算的要用简便方法计算.2008-900÷15×120.5×(1.6+4.2
问题详情
计算下面各题,能简算的要用简便方法计算.
2008-900÷15×12
0.5×(1.6+4.2÷0.3)
(
45×(
参考答案
(1)2008-900÷15×12
=2008-60×12,
=2008-720,
=1288;
(2)0.5×(1.6+4.2÷0.3)
=0.5×(1.6+14),
=0.5×15.6,
=7.8;
(3)35+411+25+711
=(35+25)+(411+711),
=1+1,
=2;
(4)(34-34×56)÷98
=[(1-56)×34)]÷98,
=[16×34]×89,
=18×89;
=19;
(5)512÷[38×(79-12)]
=512÷[38×518],
=512×485,
=4;
(6)45×(89+215-35)
=45×89+45×215-45×35,
=40+6-27,
=19.
考点:方法