(-1.25)除2又1⼀12 0除(-5)乘108 -4除2⼀3乘3⼀2除1⼀4 2除(-3⼀7)乘4⼀7除(-8⼀3)

小升初有理数的乘法和除法
2024-11-25 20:28:12
推荐回答(2个)
回答1:

解:

(-1.25)除2又1/12 

=-1.25÷25/12

=-1.25x12/25

=-0.6



0除(-5)乘108 

=0   (0除以任何数都为0)


-4除2/3乘3/2除1/4 

=-4×3/2×3/2×4

=-6×6

=-36


2除(-3/7)乘4/7除(-8/3)

=2×7/3×4/7×3/8

=2×(7/3×4/7×3/8)

=2×1/2

=1

回答2:

-1.25=-5/4 2又1/12=25/12
(-1.25)除2又1/12
=-5/4÷25/12
=-5/4×12/25
=-3/5

0除(-5)乘108
=0

-4除2/3乘3/2除1/4
=-4×3/2×3/2×4
=-36

2除(-3/7)乘4/7除(-8/3)
=2×7/3×4/7×3/8 【先解决正负号问题,负负得正】
=1