数学问题!!急!!!今天要用!!

Question

就是这几道题我不会!!!30分(系统20分)
1.用简便方法计算.(混合运算)(括号看你们的写多少!)
1. 486-57-143
=
=
2. 152×32
=
=
3. 75×3×4
=
=

帮忙一下!!!!急啊!!今天要用!!
一定要简便啊~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~简便~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
我是马上采纳的!!!!!

Answer 1

1.486-(57+143);2.应该是125*32吧那怎样的话等于125*8*4;3.75=25*3所以就等于25*3*3*4

Answer 2

486-57-143=486-（57+143）=486-200=286
152*32=？？貌似没什么简便的方法了
75*3*4=75*4*3=200*3=600

Answer 3

1. 486-57-143
= 486-(57+143)
= 486-200
= 286
2. 152×32
= 152*(4*8)
= 152*4*8
= 608*8
= 4864
3. 75×3×4
= (75*4)*3
= 300*3
= 900

Answer 4

1.486-(57+143)
=286
2.152*30+152*2
=
3.75*4*3
=200*3
=600

Answer 5

468-57-143
=468-(57+143)
=468-200
=268
152×32
=?
75×3×4
=15×4×5×3
=60×5×3
=900