Question

什么÷3-4:=0

下列各式:⑴(-3.4)÷0 ⑵0÷(-3.4) ⑶0÷0 ⑷(-3.4)÷(+3.4)*0 其中可以进行运算的只有
A.⑴⑵⑶ B.⑵⑷C.⑵⑶D.⑵⑶⑷
下列运算正确的是:(2/1=二分之一)
A.(-2/1)÷(-3/2)*3=(-2/1)÷[(-3/2)*3]
B.(-2/1)÷(-3/2)*3=[(-2/1)÷(-3/2)]*3/1
C.(-2/1)÷(-3/2)*3=(-2/1)*(-2/3)*3/1
D.(-2/1)÷(-3/2)*3=(-2/1)*(-2/3)*3
-8÷(-4又2/1)÷(-2又3/2)
=
=
[(1又2/1)+(-4又2/1)]÷(-4)÷(-3/1)
=
=
已知a,b互为相反数,c,d互为倒数,且x的绝对值是5,试求
x-(a+b+cd)+|a+b|+|3-cd|的值.
还有一个:
已知m=3b分之a+4分之ab+3,当a=3,b为a的倒数时,求m的值.

Answer 1

B.⑵⑷
下列运算正确的是A
-8÷(-4又2/1)÷(-2又3/2)
=[ -8*(-9/2)])÷(-2又3/2)
= 9/16*(-8/3)
=-3/2
[(1又2/1)+(-4又2/1)]÷(-4)÷(-3/1)
= (2/3-2/9)÷(-4)÷(-3/1)
= (-3)÷(-4)÷(-3/1)
=(4/3)*(-3)
=4
a,b互为相反数,a+b=0.c,d互为倒数,cd=1
x-(a+b+cd)+|a+b|+|3-cd|
=x-(0+1)+0+|3-1|
=x-1+2
=x+1
x=5,值=6
x=-5,值=-4
b为a的倒数,ab=1,b/a=b*b,a=3,b=3分之1
m=3b分之a+4分之ab+3
=3b*b+4分之1+3
=3分之1+4分之1+3
=3又12分之7