Question

18．直接写得数

0.25×3=	2+0.78=	0.56×100=	4.2÷0.14=
0.99+1.8=	0÷4.86=	1.5×0.4=	7.8+0.3-7.8+0.3=
6.4÷0.08=	12.5×0.8=	5.1÷1.7=	0.25×4.3×4=

Answer 1

分析 根据小数加减乘除法运算的计算法则计算即可求解．注意7.8+0.3-7.8+0.3变形为（7.8-7.8）+（0.3+0.3）计算，0.25×4.3×4变形为0.25×4×4.3计算．

解答 解：

0.25×3=0.75	2+0.78=2.78	0.56×100=56	4.2÷0.14=30
0.99+1.8=2.79	0÷4.86=0	1.5×0.4=0.6	7.8+0.3-7.8+0.3=0.6
6.4÷0.08=80	12.5×0.8=10	5.1÷1.7=3	0.25×4.3×4=4.3

点评 考查了小数加减乘除法运算，关键是熟练掌握计算法则正确进行计算．