做5.6.7.8题
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做5.6.7.8题
做5.6.7.8题
做5.6.7.8题
(5)22+(-4)+(-2)+4
=18-2+4
=16+4
=20
(6)4.6-(3/4+1.5-4)-3/4
=(4.6+4)-(3/4+3/4)-1.5
=8.6-(1.5+1.5)
=8.6-3
=5.6
(7)(1/2-3+5/6-7/12)÷(-1/36)
=(1/2-3+5/6-7/12)x(-36)
=-1/2x36+3x36-5/6x36+7/12x36
=-18+108-30+21
=81
(8)原式=[1/6-1/6]÷(-8)
=0÷(-8)
=0