计算下面各题,能用简便算法的用简便算法(1)12.25-3.1+0.85-6.17 (2)(1....

2025-06-22 02:25:21
推荐回答(1个)
回答1:

(1)12.25-3.1+0.85-6.17
=(12.25+0.85)-3.1-6.17
=13.1-3.1-6.17
=10-6.17
=3.83;

(2)(1.9-1.9×0.9)÷(3.8-2.8)
=(1.9-1.71)÷(3.8-2.8)
=0.19÷1
=0.19;

(3)2.65×1.7+1.35×1.7
=(2.65+1.35)×1.7
=4×1.7
=6.8;

(4)630÷[2.98+6.5×(3.2-3.12)]
=630÷[2.98+6.5×0.08]
=630÷[2.98+0.52]
=630÷3.5
=180.