问题
解答题
简便计算:
70.8-1.25-1.75
7.2×4.8+7.2×5.2
0.25×17.3×4
0.25×(4+0.4)
答案
(1)70.8-1.25-1.75
=70.8-(1.25+1.75)
=70.8-3
=67.8;
(2)7.2×4.8+7.2×5.2
=7.2×(4.8+5.2)
=7.2×10
=72;
(3)0.25×17.3×4
=0.25×4×17.3
=1×17.3
=17.3;
(4)0.25×(4+0.4)
=0.25×4+0.25×0.4
=1+0.1
=1.1.