问题 解答题

脱式计算.(能简算的要简算)

2.14×15.4+0.46×21.4

8.05÷3.5×1.5-3

140÷1.25÷0.8

100.7-(75+9.6÷0.4)

答案

(1)2.14×15.4+0.46×21.4,

=2.14×15.4+4.6×2.14,

=2.14×(15.4+4.6),

=2.14×20,

=42.8;

(2)8.05÷3.5×1.5-3,

=2.3×1.5-3,

=3.45-3,

=0.45;

(3)140÷1.25÷0.8,

=140÷(1.25×0.8),

=140÷1,

=140;

(4)100.7-(75+9.6÷0.4),

=100.7-(75+24),

=100.7-99,

=1.7.

单项选择题
单项选择题