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脱式计算.(能简便计算的要简算)3.7×1.4×0.051.4×25+3.450.8×(12.5-1.25)1.5×1021.25×0.7×0.88.65-3.7+1.35-6.3.

题目详情
脱式计算.(能简便计算的要简算)
3.7×1.4×0.05           1.4×25+3.45           0.8×(12.5-1.25)
1.5×102              1.25×0.7×0.8           8.65-3.7+1.35-6.3.
▼优质解答
答案和解析
(1)3.7×1.4×0.05
=3.7×(1.4×0.05)
=3.7×0.07
=0.259;

(2)1.4×25+3.45
=35+3.45
=38.45;

(3)0.8×(12.5-1.25)
=0.8×12.5-0.8×1.25
=10-1
=9;

(4)1.5×102
=1.5×(100+2)
=1.5×100+1.5×2
=150+3
=153;

(5)1.25×0.7×0.8
=1.25×0.8×0.7
=1×0.7
=0.7;

(6)8.65-3.7+1.35-6.3
=(8.65+1.35)-(3.7+6.3)
=10-10
=0.