代数式的值 练习 求答案!!!
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解决时间 2021-04-12 17:44
- 提问者网友:爱唱彩虹
- 2021-04-12 10:15
求代数式2a(a-1)/、当m=4,n=3/4时,求下列代数式的值
(1)1、a分别取下列值时.a=1/3的值
(1).a=4/3
(2);2
2
最佳答案
- 五星知识达人网友:往事隔山水
- 2021-04-12 11:39
2-1)*(1Ǘ、(1)当a=4/3时;-(3/3)*(1/2时,
2a(a-1)/4时
m²-n²
=4²3)*(4/2)*(1/
=16-9/16
=15又7/3
=2*(1/3)
=-1/6
2、当m=4,n=3/3-1)/3
=2*(4/4)²3)*(1/3)
=8/27
(2)当a=1/3)
=-1/2*(1/,
2a(a-1)/3
=2*(4/
2a(a-1)/4时
m²-n²
=4²3)*(4/2)*(1/
=16-9/16
=15又7/3
=2*(1/3)
=-1/6
2、当m=4,n=3/3-1)/3
=2*(4/4)²3)*(1/3)
=8/27
(2)当a=1/3)
=-1/2*(1/,
2a(a-1)/3
=2*(4/
全部回答
- 1楼网友:英雄的欲望
- 2021-04-12 12:51
1、(1)当a=4/3时,
2a(a-1)/3
=2*(4/3)*(4/3-1)/3
=2*(4/3)*(1/3)*(1/3)
=8/27
(2)当a=1/2时,
2a(a-1)/3
=2*(1/2)*(1/2-1)*(1/3)
=-1/2*(1/3)
=-1/6
2、当m=4,n=3/4时
m²-n²
=4²-(3/4)²
=16-9/16
=15又7/16
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