有理数的乘除法1.|0|-(+10)+|-4|-(-15)-|16.2| 2.5又3/7+6又4/5-(+5又3/7)+(-4又1/5)3.(-3/8)×16+0.5×(-5)×(-4)-(-24)×(-5/24) 4.2-2÷1/3×3 5.-5/7÷[3又1/2×(-5/7)-(-5/7)×2又1/2+5/7×1/2]
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有理数的乘除法1.|0|-(+10)+|-4|-(-15)-|16.2| 2.5又3/7+6又4/5-(+5又3/7)+(-4又1/5)3.(-3/8)×16+0.5×(-5)×(-4)-(-24)×(-5/24) 4.2-2÷1/3×3 5.-5/7÷[3又1/2×(-5/7)-(-5/7)×2又1/2+5/7×1/2]
有理数的乘除法1.|0|-(+10)+|-4|-(-15)-|16.2| 2.5又3/7+6又4/5-(+5又3/7)+(-4又1/5)
3.(-3/8)×16+0.5×(-5)×(-4)-(-24)×(-5/24)
4.2-2÷1/3×3 5.-5/7÷[3又1/2×(-5/7)-(-5/7)×2又1/2+5/7×1/2]
有理数的乘除法1.|0|-(+10)+|-4|-(-15)-|16.2| 2.5又3/7+6又4/5-(+5又3/7)+(-4又1/5)3.(-3/8)×16+0.5×(-5)×(-4)-(-24)×(-5/24) 4.2-2÷1/3×3 5.-5/7÷[3又1/2×(-5/7)-(-5/7)×2又1/2+5/7×1/2]
|0|-(+10)+|-4|-(-15)-|16.2|=-10+4+15-16.2=-7.2
5又3/7+6又4/5-(+5又3/7)+(-4又1/5)=(5+6-5-4)+(3/7+4/5-3/7-1/5)=2+3/5=2.6
(-3/8)×16+0.5×(-5)×(-4)-(-24)×(-5/24)=-6+10-5=-1
2-2÷1/3×3=2-2×3×3=2-18=-16
-5/7÷[3又1/2×(-5/7)-(-5/7)×2又1/2+5/7×1/2]
=-5/7÷[(-5/7)(3又1/2-2又1/2-1/2)]=-5/7÷(-5/7)÷(3又1/2-2又1/2-1/2)
=1÷0.5=2