计算与化简（1）(−12)−(−314)+(+234)−(+512)（2）−22+|5−8|+24÷(−3)×13（3）−216×5−216×(−4)+136×(−8)（4）1−12×[3×(−23)2−(−1)4]+14÷(−12)3（5）4x3−[−x2−2(x3−12x2+1)]（6）4ab-3b2-[（a2+b2）-

Question

计算与化简
（1）(−(1)/(2))−(−3(1)/(4))+(+2(3)/(4))−(+5(1)/(2))
（2）−22+|5−8|+24÷(−3)×(1)/(3)
（3）−2(1)/(6)×5−2(1)/(6)×(−4)+(13)/(6)×(−8)
（4）1−(1)/(2)×[3×(−(2)/(3))2−(−1)4]+(1)/(4)÷(−(1)/(2))3
（5）4x3−[−x2−2(x3−(1)/(2)x2+1)]
（6）4ab-3b²-[（a²+b²）-（a²-b²）]．

Answer 1

（1）(−(1)/(2))−(−3(1)/(4))+(+2(3)/(4))−(+5(1)/(2))
=（-(1)/(2)-5(1)/(2)）+（3(1)/(4)+2(3)/(4)）
=-6+6
=0；

（2）−22+|5−8|+24÷(−3)×(1)/(3)
=-4+3-8×(1)/(3)
=-4+3-2(2)/(3)
=-3(2)/(3)；

（3）−2(1)/(6)×5−2(1)/(6)×(−4)+(13)/(6)×(−8)
=-(13)/(6)×（5-4+8）
=-(13)/(6)×9
=-19.5；

（4）1−(1)/(2)×[3×(−(2)/(3))2−(−1)4]+(1)/(4)÷(−(1)/(2))3
=1-(1)/(2)×[3×(4)/(9)-1]+(1)/(4)÷（-(1)/(8)）
=1-(1)/(2)×[(4)/(3)-1]-2
=1-(1)/(2)×(1)/(3)-2
=1-(1)/(6)-2
=-1(1)/(6)；

（5）4x3

作业帮用户 2017-09-17