问题 解答题

脱式计算,能简算的要简算

①2.9×1.4+2×1.6

②(2.44-1.8)÷0.4×20

③4.6×9+4.6.

答案

①2.9×1.4+2×1.6,

=4.06+3.2,

=7.26;

②(2.44-1.8)÷0.4×20,

=0.64÷0.4×20,

=1.6×20,

=32;

③4.6×9+4.6,

=4.6×9+4.6×1,

=(9+1)×4.6,

=10×4.6,

=46.

单项选择题
单项选择题