1、(-4)*(-5)*0.25
问题描述:
1、(-4)*(-5)*0.25
2、 (1/3+1/4-1/6)*24
3、 (-2.1)*6.5*(-3/7)
4、 36/(1/2*1/3)的平方
5、 (3/4-7/8)除以(-7/8)
6、 -3/2*[(-2/3)的平方-2]
4、 36*(1/2*1/3)的平方
不好意思,说错了
答
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