7/15- ()/3=2/15 ()/8-1/10=1/407/15- ()/3=2/15 ()/8-1/10=1/405/()+5/9=5/6
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7/15-()/3=2/15()/8-1/10=1/407/15-()/3=2/15()/8-1/10=1/405/()+5/9=5/67/15-()/3=2/15()/8-1/10=1/407/15
7/15- ()/3=2/15 ()/8-1/10=1/407/15- ()/3=2/15 ()/8-1/10=1/405/()+5/9=5/6
7/15- ()/3=2/15 ()/8-1/10=1/40
7/15- ()/3=2/15 ()/8-1/10=1/40
5/()+5/9=5/6
7/15- ()/3=2/15 ()/8-1/10=1/407/15- ()/3=2/15 ()/8-1/10=1/405/()+5/9=5/6
1/3
1/8
5/18
(-15)-3-7+8=( )
(x-15)/15=7/3
7/8×15表示( ),6×2/3表示( )
-2,3,-4,-7,-8,15,-16,( ),( )
计算.(—8)+15+2+(—7)=
7/15- ()/3=2/15 ()/8-1/10=1/407/15- ()/3=2/15 ()/8-1/10=1/405/()+5/9=5/6
方程验算3-9(8-x)=-6(15-2x)x=7
8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/15-4/20 = 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/15-4/20 = 是7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20)=10/15-4/20 = (简算)
1,2,3,7,8,17,15,()
(-15)/(1/3-3/2-3)x6(-7/8)/(7/4-7/8-7/12)
14/15-(14/15-4/5)简算5/7+(2/7+3/8)
(15-x)(32-2x)=7/8*15*32怎么算?
X-3/7=(3X+2-53)/15
-11-6x=7+8x -3+2-7=4x-15-8x ( 解方程)7x-6-8x+12=-3x+9-3+2-7=4x-15-8x
7(2x-3)+15=2x-6
(3/8+1/15)x8+7/15(简算)
3/2-5/3=( )-()=() 7/3-21/2=()-()=() 8/3+6/1=()+(3/2-5/3=( )-()=()7/3-21/2=()-()=() 8/3+6/1=()+()=()15/2+35/1=()+()=()
3/2-5/3=( )-()=() 3/2-5/3=( )-()=() 7/3-21/2=()-(3/2-5/3=( )-()=()7/3-21/2=()-()=() 8/3+6/1=()+()=()15/2+35/1=()+()=()