学霸求过程3题啊急啊
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(1)
=[2.5-(28-33+6)]×0.2
=(2.5+1)×0.2
=3.5×0.2
=0.7
(2)
=4/7×(7.665-4.165)+14-30+28
=4/7×7/2-14
=2-14
=-12
(3)
=2-5+2-6+5/6-2/7+1/6+8/21
=-7+1+2/21
=-5又19/21
=[2.5-(28-33+6)]×0.2
=(2.5+1)×0.2
=3.5×0.2
=0.7
(2)
=4/7×(7.665-4.165)+14-30+28
=4/7×7/2-14
=2-14
=-12
(3)
=2-5+2-6+5/6-2/7+1/6+8/21
=-7+1+2/21
=-5又19/21
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