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1.7-1.7*(07+0.2)(4.5*0.6\4.5*0.6)\0.40.25*(8.087-5.628\4)用简便计算,能简便的简便!急

题目详情
1.7-1.7*(07+0.2) (4.5*0.6\4.5*0.6)\0.4 0.25*(8.087-5.628\4) 用简便计算,能简便的简便!急
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答案和解析
1.7-1.7*(0.7+0.2)
=1.7-1.7x0.9
=1.7x(1-0.9)
=1.7x0.1
=0.17
(4.5*0.6\4.5*0.6)\0.4
=[(4.5÷4.5)x0.6x0.6]÷0.4
=1x0.36÷0.4
=0.9
0.25*(8.087-5.628\4)
=0.25x(8.087-1.407)
=0.25x6.68
=0.5x3.34
=1.67
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