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脱式计算(用自己喜欢的方法计算)16×12.5×4.57.2÷0.18+20.5×3.61.2×2.5+0.08×2578÷12.5÷0.84.6+5.4×(0.25+0.5)68+(32-0.299÷0.23)

题目详情
脱式计算(用自己喜欢的方法计算)
16×12.5×4.5        7.2÷0.18+20.5×3.6         1.2×2.5+0.08×25
78÷12.5÷0.8        4.6+5.4×(0.25+0.5)68+(32-0.299÷0.23)
▼优质解答
答案和解析
(1)16×12.5×4.5
=2×8×12.5×4.5
=8×12.5×4.5×2
=(8×12.5)×(4.5×2)
=100×9
=900;

(2)7.2÷0.18+20.5×3.6
=40+73.8
=113.8;

(3)1.2×2.5+0.08×25
=1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5;

(4)78÷12.5÷0.8
=78÷(12.5×0.8)
=78÷10
=7.8;

(5)4.6+5.4×(0.25+0.5)
=4.6+5.4×0.75
=4.6+4.05
=0.55;

(6)68+(32-0.299÷0.23)
=68+(32-1.3)
=68+32-1.3
=100-1.3
=98.7.