下面各题,怎样算简便就怎样算.6.8÷4-1.2×25%+4 25×0.25 3.7×34+5.3×0.75+34 38×337 9.9+99
下面各题,怎样算简便就怎样算.6.8÷4-1.2×25%+425×0.253.7×34+5.3×0.75+3438×3379.9+99.9+999.9(512+115)×...
下面各题,怎样算简便就怎样算.6.8÷4-1.2×25%+4 25×0.25 3.7×34+5.3×0.75+34 38×337 9.9+99.9+999.9 (512+115)×24×15.
展开
1个回答
展开全部
(1)6.8÷4-1.2×25%+4,
=1.7-1.2×
+4,
=1.7-0.3+4,
=5.4;
(2)
×0.25=0.1;
(3)3.7×
+5.3×0.75+
,
=3.7×0.75+5.3×0.65+0.75,
=(3.7+5.3+1)×0.75,
=10×0.75,
=7.5;
(4)38×
,
=(37+1)×
,
=37×
+
,
=3+
,
=3
;
(5)9.9+99.9+999.9,
=(10-0.1)+(100-0.1)+(1000-0.1),
=(10+100+1000)-0.1×3,
=1110-0.3,
=1109.7;
(6)(
+
)×24×15,
=
×24×15+
×24×15,
=150+24,
=174.
=1.7-1.2×
1 |
4 |
=1.7-0.3+4,
=5.4;
(2)
2 |
5 |
(3)3.7×
3 |
4 |
3 |
4 |
=3.7×0.75+5.3×0.65+0.75,
=(3.7+5.3+1)×0.75,
=10×0.75,
=7.5;
(4)38×
3 |
37 |
=(37+1)×
3 |
37 |
=37×
3 |
37 |
3 |
37 |
=3+
3 |
37 |
=3
3 |
37 |
(5)9.9+99.9+999.9,
=(10-0.1)+(100-0.1)+(1000-0.1),
=(10+100+1000)-0.1×3,
=1110-0.3,
=1109.7;
(6)(
5 |
12 |
1 |
15 |
=
5 |
12 |
1 |
15 |
=150+24,
=174.
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询