9=72 8=56 7=42 6=30 5=20 3=?
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9=72 8=56 7=42 6=30 5=20 3=?
9=72 8=56 7=42 6=30 5=20 3=?
9=72 8=56 7=42 6=30 5=20 3=?
9
9=72 8=56 7=42 6=30 5=20 3=?
1/30+1/42+1/56+1/72=
简算1/30+1/42+1/56+1/72=?
56:7=x:9
6+4=210,9+2=711,8+5=313,5+2=37,7+6=?
7/5-14/5= 9/8-6/5=
1=10 2=20 3=30 4=40 5=501=10 2=20 3=30 4=40 5=50 6=60 7=70 8=80 9=90 10=?
3/8+13/18= 5/6+8/9= 2/7+1/3= 7/12-3/8=
5+3=28 9+1=810 8+6=214 5+4=195+3=28 9+1=810 8+6=214 5+4=19 then,7+3=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=______1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 =1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1
1+2/1-6/5+12/7-20/9+30/11-42/13+56/15-72/17=?,这是/分数线
{}+{}={}{}—{}={} {}*{}={} 1,2,3,4,5,6,7,8,9,0.
列方程 X+3.5=91 3X=57 X—3=6 X÷8列方程X+3.5=91 3X=57X—3=6 X÷8=1.36X+3=9 4X—2=105X—39=56 18+5X=218X—4×14=0 7X÷3=8.19
56÷7=?
5☆2=9 6☆1=10 2☆2=7 9☆3=26 8☆2=15☆2=9 6☆1=10 2☆2=79☆3=26 8☆2=12 5☆7=387☆3=20 5☆2=6 6☆5=335☆8=() 9☆8=)4☆4=()
用竖式计算:7.83÷9= 4.08÷8= 0.54÷6= 14.21÷7=
填空.8分之5×( )=( )×7分之11=8×( )=9分之7×( )=1
3/2-5/6+7/12-9/20+11/30-13/42=()