做5.6.7.8题

2025-01-24 16:40:13
推荐回答(1个)
回答1:

(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