问题
解答题
计算下面各题.(能简便计算的要简便计算)
4.2×(6.18-3.03)+6.3
15.02-6.8-(1.02+1.2)
0.6×[(5-0.68)÷1.2]
2.7÷4+6.3×0.25
(6.02+2.8)÷0.4-2.05
3.08×3.5+6.2×3.08+3.08×0.3.
答案
(1)4.2×(6.18-3.03)+6.3,
=4.2×3.15+6.3,
=13.23+6.3,
=19.53;
(2)15.02-6.8-(1.02+1.2),
=15.02-6.8-1.02-1.2,
=(15.02-1.02)-(6.8+1.2),
=14-8,
=6;
(3)0.6×[(5-0.68)÷1.2],
=0.6×[4.32÷1.2],
=0.6×3.6,
=2.16;
(4)2.7÷4+6.3×0.25,
=2.7×0.25+6.3×0.25,
=(2.7+6.3)×0.25,
=9×0.25,
=2.25;
(5)(6.02+2.8)÷0.4-2.05,
=8.82÷0.4-2.05,
=22.05-2.05,
=20;
(6)3.08×3.5+6.2×3.08+3.08×0.3,
=(3.5+6.2+0.3)×3.08,
=10×3.08,
=30.8.