78*56 208递等式方法
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再问:我还有两道数学题:1.从100克海水中提取出3克盐,照这样计算,一千克海水可提取多少盐?2.把1234567这七个数字分别填在扩号里,使竖式成立。0.0()()0.()()0.()()0.()(
2001÷1999/2000=2001*2000/1999=2001*(1+1/1999)=2001+2001/1999=2002又2/1999
102*36=(100+2)*36=3600+72=3672
1883-398=1883-(400-2)=1883-400+2=1483+2=1485
(1)2005×18-200.5×90+20050×0.1=2005×18-2005×9+2005=2005×(18-9+1)=2005×10=20050(2)(0.75×2.6×2.7)÷(0.13
125×25×56=125×25×4×2×7=(125×2)×(25×4)×7=250×100×7=25000×7=175000
=18×9+1/9×9=162+1=163.用分配律
870×65+87×350=87×650+87×350=87×(650+350)=87×1000=870009999×7778+3333×6666=9999×7778+9999×2222=9999×(
72×125=9×8×125=9×1000=9000
68*52=68*(50+2)=68*50+68*2=3400+136=353668*52=(60+8)*52=60*52+8*52=3120+416=353668*52=(60+8)*(60-8)=
167×59/166=(166+1)x59/166=166x59/166+1x59/166=59又59/166
莉莉_Cc①392.6×192-39260×0.92=392.6×192-392.6×92=392.6×(100+92)-392.6×92=392.6×100+392.6×92-392.6×92=39
5498-(1928+1072)-(1613+387)=5498-2000-2000=1498
0.98-0.036-0.064=0.98-(0.036+0.064)=0.98-0.1=0.888.57×103-8.57×3=8.57×(103-3)=8.57×100=8571.01×1.01-
5.4+[8x(6.34-3.59)]=5.4+8X2.75=5.4+22=27.4
102*63=(100+2)*63=100*63+2*63=6300+126=6426
/>56x32=56x(30+2)=56x30+56x2=1680+112=1792
8.54-5.96=8.5+0.04-(6-0.04)=8.5+0.04-6+0.04=8.5-6+(0.04+0.04)=2.5+0.08=2.58再问:这像是小学四年级写的么.......再答:8
1/3=1/(1*3)=1/2(1-1/3)1/15=1/(3*5)=1/2(1/3-1/5).1/3+1/15+1/35+1/63+1/99=1/2(1-1/3+1/3-1/5+1/5-1/7+1/
98×43=(100-2)×43=100×43-2×43=4300-86=4214