12道有理数计算（写步骤）!

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/05/09 14:23:12

12道有理数计算（写步骤）!
（-8/7)X0.25X(-1/4)X9
(-3/2)-(+1/2)-(-5/6)-(-1/3)
|5/6-5/7|-5/6-2/7
-8X(1/6-5/12+3/10)X15
1/42÷（2/7+1/6-3/14+2/3)
(-2/7-1/6+3/14+3/2)÷(-1/42)
60X3/7-60X1/7+60X5/7
-3÷(-2又2/3)÷(-1又1/8)
(-3又1/2)÷(-1又1/4)÷8/5
-8X(-1又2/3)X(-0.125)÷3/5
-3/5X(-3又2/1)÷（1又1/4）÷3
-0.25X0.5X(-3又1/5)X4

1.
（-8/7)X0.25X(-1/4)X9
= （8/7) * （1/4）*(1/4) *9
= （2/7）*(1/4) *9
= 1/14 *9 =9/14
2.
(-3/2)-(+1/2)-(-5/6)-(-1/3)
=(-3/2 -1/2) + (5/6 +1/3)
= -2 + 7/6
= 1/6.
3.
|5/6-5/7|-5/6-2/7
=(5/6 -5/7) -5/6 -2/7
= -1.
4.
-8X(1/6-5/12+3/10)X15
= -120 *(1/6-5/12+3/10)
= -20 +50 -36
= -6.
5.
1/42÷（2/7+1/6-3/14+2/3)
=1/[42 *（2/7+1/6-3/14+2/3) ]
=1/(12 +7 -9 +28)
= 1/38.
6.
(-2/7-1/6+3/14+3/2)÷(-1/42)
=(-2/7-1/6+3/14+3/2)*(-42)
=12 +7 -9 -63
= -53.
7.
60X3/7-60X1/7+60X5/7
=60 *(3/7 -1/7 +5/7)
=60 *1
= 60
8.
-3÷(-2又2/3)÷(-1又1/8)
=-3/(-8/3)/(-9/8)
=-3 *(-3/8) *(-8/9)
=9/8 *(-8/9)
= -1
9.
(-3又1/2)÷(-1又1/4)÷8/5
= (-7/2)÷(-7/4)÷8/5
=(-7/2) *(-4/7) *(5/8)
=2 *(5/8)
= 5/4
10.
-8X(-1又2/3)X(-0.125)÷3/5
= -8 *(-5/3) *(-1/8) *(5/3)
= (-8)*(-1/8)*(-5/3) *(5/3)
= -25/9
11.
-3/5X(-3又1/2)÷（1又1/4）÷3
= (-3/5) *(-7/2) *(4/7) *(1/6)
=(-3/5)*(1/6) *(-7/2) *(4/7)
= -1/10 *(-2)
= 1/5
12.
-0.25X0.5X(-3又1/5)X4
=(-1/4) *(1/2) *(-16/5)*4
=(-1/4))*4 *(1/2) *(-16/5)
= -1 *(-8/5)
= 8/5

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