这三道题,怎么做?要过程
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1-0.2x[-3-4x(18/5-53/10)]
=1-0.2x[-3-4x(36/10-53/10)]
=1-0.2x[-3-4x-17/10]
=1-0.2x[-3-(-34/5)]
=1-0.2X19/5
=1-19/25
=6/25
2)=-22/7X(66/21-28/21)X7/22X(-21/22)
=-22/7X38/21X7/22X(-21/22)
=(-38/21)X(-21/22)
=19/11
3) ={0.85-[12+4X(-7)]}/5
={0.85-[12+(-28)]}/5
={0.85-(-16)}/5
=16.85/5
=3.37
=1-0.2x[-3-4x(36/10-53/10)]
=1-0.2x[-3-4x-17/10]
=1-0.2x[-3-(-34/5)]
=1-0.2X19/5
=1-19/25
=6/25
2)=-22/7X(66/21-28/21)X7/22X(-21/22)
=-22/7X38/21X7/22X(-21/22)
=(-38/21)X(-21/22)
=19/11
3) ={0.85-[12+4X(-7)]}/5
={0.85-[12+(-28)]}/5
={0.85-(-16)}/5
=16.85/5
=3.37
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