999*2224+6666*1664,2012*2012-2010*2011,1999+199.9+19.99+1.99
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999*2224+6666*1664,2012*2012-2010*2011,1999+199.9+19.99+1.999怎样简便计算?
999*2224+6666*1664,2012*2012-2010*2011,1999+199.9+19.99+1.999怎样简便计算?
999*2224+6666*1664,2012*2012-2010*2011,1999+199.9+19.99+1.999怎样简便计算?
999*2224+6666*1664,
=(1000-1)*2224+6666*(1000+664)
=1000*2224-2224+6666*1000+6666*664
=(2224+6666)*1000+6666*664-2224
=8890*1000+4426224-2224
=8890000+4424000
=13314000
第一题没什么好办法,最好硬算
2012*2012-2010*2011,
=(2010+2)*2012-2010*2011
=2010*2012+2*2012-2010*2011
=2010*(2012-2011)+2*2012
=2010+4024
=6034
1999+199.9+19.99+1.999
=(2000-1)+(200-0.1)+(20-0.01)+(2-0.001)
=2000+200+20+2-(1+0.1+0.01+0.001)
=2222-1.111
=2220.889
=(1000-1)*2224+6666*(1000+664)
=1000*2224-2224+6666*1000+6666*664
=(2224+6666)*1000+6666*664-2224
=8890*1000+4426224-2224
=8890000+4424000
=13314000
第一题没什么好办法,最好硬算
2012*2012-2010*2011,
=(2010+2)*2012-2010*2011
=2010*2012+2*2012-2010*2011
=2010*(2012-2011)+2*2012
=2010+4024
=6034
1999+199.9+19.99+1.999
=(2000-1)+(200-0.1)+(20-0.01)+(2-0.001)
=2000+200+20+2-(1+0.1+0.01+0.001)
=2222-1.111
=2220.889
999*2224+6666*1664,2012*2012-2010*2011,1999+199.9+19.99+1.99
1999+199.9+19.99+1.999 简算
1999+199.9+19.99+1.999=?
巧算 1.999+19.99+199.9+1999
1999+199.9+19.99+1.999+0.1999
1999+199.9+19.99+1.999+2.111简便运算
简算1999+199.9+19.99+1.999+0.1999
1999+199.9+19.99+1.999=(简便运算)
简便计算、、、、、、、1999+199.9+19.99+1.999 请
1999*3.14+199.9*31.4+19.99*314 简算
巧算∶1.999+19.99+199.9+1999
1999*3.14 199.9*3.14 19.99*3.14=?