1/2 4分之3 7/8加5/36 32分之31 63/64解题的步骤等于多少
1/2 4分之3 7/8加5/36 32分之31 63/64解题的步骤等于多少
1/2+3/4+7/8+15/16+31/32+63/64
=6-(1/2+1/4+1/8+1/16+1/32+1/64)
=6-(1-1/64)
=5又1/64
1/2 4分之3 7/8加15/16 32分之31 63/46加128分之127简便法怎么做
1/2+3/4+7/8+15/16++127/128+255/256=8-1/2…-1/2568-1/2…-1/256=8-(1/2(1/2^8-1)/(1/2-1))(用到了等比数列的求和公式)=8-1+1/256=7=1/256希望可以帮上忙
2分之1加3分之1加4分之一等于多少?还有5/8加7/12减15/16等于多少?
13/12、11:48
5/12减1/7加7/12减5/7等于几分之几?1减1/2减1/4减1/8减1/16等于多少?
5/12-1/7+7/12-5/7
=35/84-12/84+49/84-60/84
=(35-12+49-60)/84
=12/84
=3/41
1-1/2-1/4-1/8-1/16
=(16-8-4-2-1)/16
=1/16
7/8×1/4÷0.25等于几分之几?5/14÷5×4/5等于几分之几?
7/8×1/4÷0.25
=7/8×1/4÷1/4
=7/8
=8分之7
5/14÷5×4/5
=1/14x4/5
=2/35
=35分之2
3又5分之1/(+4分之3)-4分之3*(-15分之2)+3有15分之7/(-3分之4) 等于多少?
3又5分之1/(+4分之3)-4分之3*(-15分之2)+3有15分之7/(-3分之4)
=(16/5)/(3/4)+(3/4)*(2/15)-(52/15)/(4/3)
=(16/5)*(4/3)+(3/4)*(2/15)-(52/15)*(3/4)
=64/15+1/10-13/5
=(128+3-78)/30
=53/30
-1×1/2等于-1+1/2-1/2×1/3等于-7/2+13分之1分之1×4=1等于-1/3=4
1×1/2+1/2×1/3+1/3×1/4+1/4×1/5+1/5×1/6+1/6×1/7+1/7×1/8 =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =1-1/8 =7/8
3/4÷(5/8)=3/4×几分之几十7/1除以几分之几等于7/11×5/14
3/4÷(5/8)=3/4×几分之几十7/11除以几分之几等于7/11×5/14
3/4÷(5/8)=3/4×(8/5)
7/11÷(14/5)=7/11×5/14
1/2+4分之1+1/8加1/16+32分之1+1/64加1/128+256分之1+1/512等于
1/2+4分之1+1/8+1/16+1/32+1/64+1/128+1/256+1/512
=1-1/512
=511/512
3/8加5/8等于多少?8分之3加8分之5等于多少?
3/8+5/8 = 1
(3/8)+(5/8) = 1