7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()
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7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()7/12+19/30+5/12=()=(
7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()
7/12+19/30+5/12=()=()
9/8-(1/8+7/9)=()=()
7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()
7/12+5/12=1
7/12+19/30+5/12=1+19/30=49/30
3/19+4/19+5/19+6/19+...+19/19+20/19+21/19=?5/6-7/12+9/20-11/30+...+(19+18)/(18*19)-(20+19)/(19*20)=?
7/12+19/30+5/12=()=()9/8-(1/8+7/9)=()=()
计算:7/12×(12/7+6/7)=?1/8×【400%×(1/5×30)】
19-12%x=7
1-3/2+5/6-7/12+9/20-11/30+.-19/90+21/110=?
5/6-7/12+9/20-11/30+……-19/90+21/110 =
(12/5+19/1)乘12+19/7,简算
(12/5+19/1)乘12+19/7,简算
(-18)+5-(+12)+(-16)-(-19)=?
2、5、7、12、19、()、()
1=5 2=7 3=12 4=19 5=
(5x-12)÷5=7×(x+12)
5/6-7/12+9/20-11/30+13/42-15/56+17/72-19/90=
1-3/2+5/6-7/12+9/20-11/30+……19/90+21/110=
1-6/5+12/7-20/9+30/11-42/13+56/15-72/17+90/19=?
简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===
解方程:19-12%X=7
19/25+7/12+6/25=?