问题 解答题
计算下面各题,能简便计算的要简便计算.
①26.7+3.3×1.2+0.04
②4.8×12.5×0.8③2.5×(6+9.728÷3.2)
④24×10.2⑤6.3÷(2.1×2)⑥100.8÷[(10.79+6.49)÷4.8].
答案

(1)26.7+3.3×1.2+0.04

=26.7+3.96+0.04,

=26.7+(3.96+0.04),

=26.7+4,

=30.7;

(2)4.8×12.5×0.8

=0.8×12.5×4.8,

=10×4.8,

=48;

(3)2.5×(6+9.728÷3.2)

=2.5×(6+3.04),

=2.5×9.04,

=2.5×(10-0.06),

=2.5×10-2.5×0.06,

=25-0.15,

=24.85;

(4)24×10.2

=24×(10+0.2),

=24×10+24×0.2;

=240+4.8,

=244.8;

(5)6.3÷(2.1×2)

=6.3÷2.1÷2,

=3÷2,

=1.5;

(6)100.8÷[(10.79+6.49)÷4.8]

=100.8÷[17.28÷4.8],

=100.8÷3.6,

=28.

单项选择题
单项选择题