作业帮3.96-2.89+3.96+2.89和5.82-2.27+3.18-0.73该怎样简便计算?
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/12 17:25:16
x)3ֳ45ҳAzL,F@QC ]=s>k{`u
Onum)6CΆf.ۂik*4!&@3
L4A! ,!" {
, ls=K(Aɀ5u5
@rP,ul 젾sOrьg-`5iOv}6SV,kbc @'Mnz:Ny6}۳ _l jYOvv>??ZH(V,c6466S8eC3? х
3.96-2.89+3.96+2.89和5.82-2.27+3.18-0.73该怎样简便计算?
3.96-2.89+3.96+2.89和5.82-2.27+3.18-0.73该怎样简便计算?
3.96-2.89+3.96+2.89和5.82-2.27+3.18-0.73该怎样简便计算?
3.96-2.89+3.96+2.89
=3.96×2+(2.89-2.89)
=(4-0.04)×2+0
=4×2-0.04×2
=8-0.08
=7.92
5.82-2.27+3.18-0.73
=(5.82+3.18)-(2.27+0.73)
=9-3
=6
由题意
f(-x)中有-2<=-x<=4
-4<=x<=2
而f(x)中是-2<=x<=4
要同时满足
-2<=x<=2
定义域[-2,2]
√63+√28
=3√7+2√7
=5√7
选C