要列式1/12x(-6)+(-1/2) 4x1x(-5) 3x(-2)x(-6)x(-5) (-5)x 8 x(-6)x(-0.25) (-0.125)x (-7) x 5 x(-16) (8/15)x 1.25 x 9/2(-3)x 5/6 x(-0.2)x(-2/7) (-2)x(-6/5)x 10/3 x(-1/4) (-19/14)x 3

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要列式1/12x(-6)+(-1/2) 4x1x(-5) 3x(-2)x(-6)x(-5) (-5)x 8 x(-6)x(-0.25) (-0.125)x (-7) x 5 x(-16) (8/15)x 1.25 x 9/2(-3)x 5/6 x(-0.2)x(-2/7) (-2)x(-6/5)x 10/3 x(-1/4) (-19/14)x 3

要列式1/12x(-6)+(-1/2) 4x1x(-5) 3x(-2)x(-6)x(-5) (-5)x 8 x(-6)x(-0.25) (-0.125)x (-7) x 5 x(-16) (8/15)x 1.25 x 9/2(-3)x 5/6 x(-0.2)x(-2/7) (-2)x(-6/5)x 10/3 x(-1/4) (-19/14)x 3
要列式
1/12x(-6)+(-1/2) 4x1x(-5) 3x(-2)x(-6)x(-5)
(-5)x 8 x(-6)x(-0.25) (-0.125)x (-7) x 5 x(-16) (8/15)x 1.25 x 9/2
(-3)x 5/6 x(-0.2)x(-2/7) (-2)x(-6/5)x 10/3 x(-1/4)
(-19/14)x 3/5 x 7/19 30 x(1/2 - 2/3+0.4) (1/2-1/3+1/4) x (-12)
-7x(-22/7) +19 x (-22/7) -5 x (-22/7)
明天就要

要列式1/12x(-6)+(-1/2) 4x1x(-5) 3x(-2)x(-6)x(-5) (-5)x 8 x(-6)x(-0.25) (-0.125)x (-7) x 5 x(-16) (8/15)x 1.25 x 9/2(-3)x 5/6 x(-0.2)x(-2/7) (-2)x(-6/5)x 10/3 x(-1/4) (-19/14)x 3
1.(1/12)x(-6)+(-1/2)=-1/2-1/2=-1.
2.4x1x(-5)=-20.
3.3x(-2)x(-6)x(-5)=-180.
4.(-5)x 8 x(-6)x(-0.25)=-60.
5.(-0.125)x (-7) x 5 x(-16)=-70.
6.(8/15)x 1.25 x 9/2
=3.
7.(-3)x 5/6 x(-0.2)x(-2/7)=-1/7.
8.(-2)x(-6/5)x 10/3 x(-1/4)=-2.
9.(-19/14)x 3/5 x 7/19=-3/10.第2-9题可以速算.
10.30 x(1/2 - 2/3+0.4)=15-20+10=5.
11.(1/2-1/3+1/4) x (-12)=-6+4-3=-5.
12.-7x(-22/7) +19 x (-22/7) -5 x (-22/7)
=22+(19-5)×(-22/7)=22-14×22/7=22-2×22=-22.
第10-12题用分配律进行简便运算.

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