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.

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