8/7*38+43*8/7-8/7 8/9*14/5*10/7 6/39*13/5-6/1 4/9*(3/1-4/1)
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/06 19:38:20
8/7*38+43*8/7-8/7 8/9*14/5*10/7 6/39*13/5-6/1 4/9*(3/1-4/1)
用递等式计算哦
用递等式计算哦
8/7*38+43*8/7-8/7
=(8/7)*(38+43-1)
=(8/7)*80
=70
8/9*14/5*10/7
=(8/9)*(14/7)*(10/5)
=(8/9)*(2/1)*(2/1)
=32/9
6/39*13/5-6/1
=(6/5)*(39/13)-6/1
=(6/5)*(3/1)-18/3
=18/5-18/3
=18/2
=9/1
4/9*(3/1-4/1)
=(4/9)*(3/1)-(4/9)*(4/1)
=4/3-(4/9)*(4/1)
=1-4/1-(4/9)*(4/1)
=1-(4/1)*(1+4/9)
=1-(4/1)*(4/13)
=1-16/13
=16/3
=(8/7)*(38+43-1)
=(8/7)*80
=70
8/9*14/5*10/7
=(8/9)*(14/7)*(10/5)
=(8/9)*(2/1)*(2/1)
=32/9
6/39*13/5-6/1
=(6/5)*(39/13)-6/1
=(6/5)*(3/1)-18/3
=18/5-18/3
=18/2
=9/1
4/9*(3/1-4/1)
=(4/9)*(3/1)-(4/9)*(4/1)
=4/3-(4/9)*(4/1)
=1-4/1-(4/9)*(4/1)
=1-(4/1)*(1+4/9)
=1-(4/1)*(4/13)
=1-16/13
=16/3
1+2-3-4+5+6-7-8+9+10-.+38-39-40+41=?-
(3/5+7/8)*40 11/3-5/7*14/15 5/6/(4/7/9/14) (5/8-1/10)*(5/9+1
小学奥数题;4*4/3*5+6*6/5*7+8*8/7*9+10*10/9*11+12*12/11*13+14*14/1
1+2+3+4+5+6+7+8+9+10+11+12+13+14+.100=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+1000=?
1*2*3+2*3*4+3*4*5+4*5*6+5*6*7+6*7*8+7*8*9+8*9*10+9*10*11+10*
1、2、3、4、5、6、7、8、9、10、
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
试计算:1-2-3-4+5-6-7-8+9-10-11-12+...+37-38-39-40
1*2*3*4*5+5*6*7*8*9/5*6*7*8*9
5×6×7×8×9分之5×6×7×8×9-1×2×3×4×5
1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````