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怎样简便就怎样算(1-0.2)×[13-(3.12+5.28)]0.25×1043.2×1.25×251÷0.025-0.025÷1(2.5+1.25)÷0.55.3×5.3+5.3×3.7+5.3.

题目详情
怎样简便就怎样算
(1-0.2)×[13-(3.12+5.28)]
0.25×104               3.2×1.25×25
1÷0.025-0.025÷1           (2.5+1.25)÷0.5            5.3×5.3+5.3×3.7+5.3.
▼优质解答
答案和解析
(1)(1-0.2)×[13-(3.12+5.28)]
=0.8×[13-8.4]
=0.8×4.6
=3.68;

(2)0.25×104
=0.25×(100+4)
=0.25×100+0.25×4
=100+1
=101;

(3)3.2×1.25×25
=(4×0.8)×1.25×25
=(4×25)×(0.8×1.25)
=100×1
=100;

(4)1÷0.025-0.025÷1
=40-0.025
=39.975;

(5)(2.5+1.25)÷0.5 
=3.75÷0.5
=7.5;

(6)5.3×5.3+5.3×3.7+5.3
=5.3×(5.3+3.7+1)
=5.3×10
=53.