(-1/2+2/3-1/4)×(-12)
=(-6/12+4/12-3/12)×(-12)
=(-6+4-3)/12×(-12)
=(-5/12)×(-12)
=5
-56×(12-2又2/5-0.6)
=-56×(12-12/5-6/10)
=-56×(120/10-24/5-6/10)
=-56×(120-24-6)/10
=-56×90/10
=-56×9
=-504
(-2/9)×(-18)+(-5/11)×(-3)×2又1/5
=(-2/9)×(-18)+(-5/11)×(-3)×11/5
=4+3
=7
[(-2)×(-4)+(-5)]×[-3-(-2)×(-3)]
=[(-2)×(-4)+(-5)]×[-3-(-2)×(-3)]
=[8-5]×[-3-6]
=3×(-9)
=-27
(-1/2+1/3-1/4-1/5)×(-20)
=(-30/60+20/60-15/60-12/60)×(-20)
=(-30+20-15-12)/60×(-20)
=(-47)/60×(-20)
=47/3
=15(2/3)
要过程计算25×(-4又1/25)时,可转化为(D)
A.25×(-4+1/25)
B.25×(4+1/25)
C.-25×(4-1/25)
D.25×(-4-1/25)
绝对值小于6的所有整数的和是?,积是?
1+2+3+4+5=15
1×2×3×4×5=120