120 42
-84 2.8571428571
360
-336
240
-210
300
-294
60
-42
180
-168
120
-84
360
-336
240
-210
300
-294
60
-42
180
5x-2(3x-5)>8
5x-6x+15>8
5x-6x>8-15
x>-7
-------------------------
2x-3(x-4)>3
2x-3x+12>3
2x-3x>3-12
-x>-9
x<9
=================
4x-2(3-x)>12
4x-6+2x>12
4x+2x>12+6
6x>18
x>3
======================
2x-3(5+x)<-3
2x-15-3x<-3
2x-3x<-3+15
-x<12
x>-12
================
4x-3(2-x)>8
4x-6+3x>8
4x+3x>8+6
7x>14
x>2
=================
2x+3(1-x)<-3
2x+3-3x<-3
2x-3x<-3-3
-x<-6
x>6
=====================
4x-3(1+x)<3
4x-3-3x<3
4x-3x<3+3
x<6
=================
2x+3(1-2x)>7
2x+3-6x>7
2x-6x>7-3
-4x>4
x<-1
===============
3x-2(1-x)>8
3x-2+2x>8
3x+2x>8+2
5x>10
x>2
==================
4x-2(x-4)>-4
4x-2x+8>-4
4x-2x>-4-8
2x>-12
x>-6
--------------------------------------------------
-----------------
1)3.5+4 2\3=3 1\2+4 2\3=7+(1*3/6+2*2\6)=7+7\6=8 1\6
2)-8 1\6+2 2\15=-6+(-1\6+2\15)=-6-(-2*5\30+2*2/30)=-6-6\30= =-6 1\5
3) 1 1\20+4 1\10=5+(1\20+2\20)=5+3\20=5 3\20
4) - 6 1\5:(-5 3\20)=31\5:103\20=31\5*20/103=124\103=1 21\103
40×9+2×9-(50×5+4×5)=360+18-250-20= 378-270=108