7/10-2/15 9/16-(9/16-1/5)7/10-2/15 9/16-(9/16-1/5)
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7/10-2/15 9/16-(9/16-1/5)7/10-2/15 9/16-(9/16-1/5)
7/10-2/15 9/16-(9/16-1/5)
7/10-2/15
9/16-(9/16-1/5)
7/10-2/15 9/16-(9/16-1/5)7/10-2/15 9/16-(9/16-1/5)
7/10-2/15
=21/30-4/30
=17/30
9/16-(9/16-1/5)
=9/16-9/16+1/5
=0+1/5
=1/5
7/10-2/15 9/16-(9/16-1/5)7/10-2/15 9/16-(9/16-1/5)
1,2,4,5,7,8,9,10,12,13,14,15,16,20题.
2/9-7/16*2/9(过程)
2/9-16/7×2/9
2/9-7/16×2/9
2/3×7/8-7/16÷3/2-15/16÷9/2=
(9/20+6/7+15/16)/(3/20+2/7+5/16)
(9/20+6/7+15/16)/(3/20+2/7+5/16)
9/16×9-7/16×7
8/9x[15/16+(7/16-1/4)÷1/2]
|12又16分之7-19又15分之4|+|18又15分之11-10又16分之9|
2-8分之15×9分之16
20-19+18-17+16-15+14-13+12-11+10-9+8-7+6-5+4-3+2-1
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19.100=?
1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16=?
1-2-3+4+5-6-7+8+9-10-11+12+13-14-15+16=+ 找规律】
1+2-3-4+5+6-7-8+9+10-11-12+13+14-15-16的简便运算,
1+2-3-4+5+6-7-8+9+10-11-12+13+14-15-16 简便方法计算