彭兴蓬
幼苗
共回答了13个问题采纳率:100% 举报
(1)-12+15-|-7-8|
=-12+15-15
=-12;
(2)(-3)×(-9)-(-5)
=27+5
=32;
(3)(-[5/6]+[2/3]-[3/4])÷[1/12]
=(-[5/6]+[2/3]-[3/4])×12
=-[5/6]×12+[2/3]×12-[3/4]×12
=-10+8-9
=-19+8
=-11;
(4)1÷(-3)×(-[1/3])
=1×[1/3]×[1/3]
=[1/9];
(5)(-3)3×[2/9]-6÷(-[2/3])2
=9+[27/8]×[2/9]-6×[9/4]
=9+[3/4]-[27/2]
=9[3/4]-13[1/2]
=-3[3/4];
(6)-22×[4[2/3]÷(-4)+(-0•4)]÷(-[1/3])
=-4×(-[14/3]×[1/4]+0)×(-3)
=-4×(-[7/6])×(-3)
=-4×
1年前
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