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下列各题怎样简便就怎样算.3.7×1.4×0.0572×0.81+10.41.4×25+3.451.5×1021.25×0.7×0.82.7×3.7+0.37×738.7×990.8×(12.5-1.25)1.25×0.4×80×2.5.

题目详情
下列各题怎样简便就怎样算.
3.7×1.4×0.05
72×0.81+10.4 1.4×25+3.45
1.5×102 1.25×0.7×0.8 2.7×3.7+0.37×73
8.7×99 0.8×(12.5-1.25) 1.25×0.4×80×2.5.
▼优质解答
答案和解析
 3.7×1.4×0.05
=3.7×(1.4×0.05)
=3.7×0.07
=0.259
 72×0.81+10.4
=58.32+10.4
=68.72
 1.4×25+3.45
=(1+0.4)×25+3.45
=25+0.4×25+3.45
=25+10+3.45
=35+3.45
=38.45
 1.5×102
=1.5×(100+2)
=1.5×100+1.5×2
=150+3
=153
 1.25×0.7×0.8
=1.25×0.8×0.7
=1×0.7
=0.7
 2.7×3.7+0.37×73
=2.7×3.7+3.7×7.3
=(2.7+7.3)×3.7
=10×3.7
=37
 8.7×99
=8.7×(100-1)
=8.7×100-8.7
=870-8.7
=861.3
 0.8×(12.5-1.25)
=0.8×12.5-0.8×1.25
=10-1
=9
 1.25×0.4×80×2.5
=(1.25×80)×(0.4×2.5)
=100×1
=100