12+6/4-3+5/4=

12+6/4-3+5/4= 5/12x(5/6+3/4)+5/4= 12/25:x=3/4:5/6 1/2+3/4-1/6+5/12=? 7／12x-x=5／6-3／4, 2+4=2×3=6 2+4+6=3×4≡12 2+4+6+8=4×5=20 2+4+6+8+10=5×6=30 2+4+.+300=( )×( )=( ) (5x+4)/6=(x-3)/4+1 2(5x+4)=3(x-3)+12 (3/4-5/6)*12/5+5/4 3(x+4)-12(x-5)=4(x+3)-6(x-3)过程 添加运算符号2 3 5 6 =6 3 4 5 6 8=8 3 4 5 6 8 =8 3 4 2 1 =6 3 4 2 1 =6 10 6 2 =4 2 12 4 4=10 3 8 4 2=4 4 9 2 3=3 3 (6x-12)(8x+5)=(4x-3)(6x-12)求x 3×4×5×6= 找规律1*4+2=6=2*3 2*5+2=12=3*4 3*6+2=20=4*5 12减4分之3=? 12加4分之3=? 5分之1加6分之1=? (5/12+1/6-3/4)×(-24) 5.2-(-3/4)+(+5/6)-(-7/12) 5x+12=6x-4 3/4:x =3/12 4/x-2=2/5 ( x+3):6=9:5