9/2×5/3 7/6×9/7 8/5×15/4 20/9×21/5
脱式计算:2\3+7\12+3\10+9\20.14\21-7\4+5\6 1又7\15-8\1-8\7+8\15
insert the missing number.4 5 3 3 6 8 7 2 5 15 4
4/5+[7/8-4/5] 7/10-[2/15+1/6] 1-1/3-1/7 5/6+11/14 5/6-[4/9-1
(14/5+4/1-7/5)*28 4-4*8/3-8/1 30*(15/4+5/3+10/7) (12/5+4/3-6
1/5+2/7+5/8+1/6+2/7+5/9-4/7+2/5+1/7+3/8-12/15+14/17=?
3,4,5,6,7,8题
3'4'5'6'7'8'9
2,3,4,5,6,7,8,
3,4,5,6,7,8,
2 3 4 5 6 7 8
(3/5+7/8)*40 11/3-5/7*14/15 5/6/(4/7/9/14) (5/8-1/10)*(5/9+1