1、（-4）*（-5）*0.25
=(-4)*(-5)*(1/4)
=(-4*(1/4))*(-5)
=-1*(-5)
=5
2、 （1/3+1/4-1/6）*24
=(1/3)*24+(1/4)*24-(1/6)*24
=8+6-4
=10
3、 （-2.1）*6.5*（-3/7）
=(-2.1)*(-3/7)*6(1/2)
=0.9*(13/2)
=(9/10)*(13/2)
=117/20
4、 36/（1/2*1/3）的平方
=36/((1/6)^2)
=36/(1/36)
=36^2
=1296?
or=(36/(1/6))^2=(36*6)^2=1679616?
5、 （3/4-7/8)除以（-7/8）
=(3/4)/(-7/8)-(7/8)/(-7/8)
=(3/4)*(-8/7)+1
=(-6/7)+1
=1/7
6、 -3/2*[（-2/3）的平方-2]
=(-3/2)((-2/3))^2-2(-3/2)
=(-3/2)(-2/3)(-2/3)+3
=1*(-2/3)+3
=7/3