1999+199.9+19.99+1.999=?
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1999+199.9+19.99+1.999=?1999+199.9+19.99+1.999=?1999+199.9+19.99+1.999=?1999+199.9+19.99+1.999=1999+
1999+199.9+19.99+1.999=?
1999+199.9+19.99+1.999=?
1999+199.9+19.99+1.999=?
1999+199.9+19.99+1.999
=1999+1+199.9+0.1+19.99+0.01+1.999+0.001-0.001-0.01-0.1-1
=2000+200+20+2-1.111
=2220.889
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)
=2220+2-1.111
=2220+0.889
=2220.889
2220.889
2220.899 用计算器就行了
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)
=2220+2-1.111
=2220+0.889
=2220.889
1999+199.9+19.99+1.999=
1999x(1+0.1+0.01+0.001)=
1999x1.111=
(2000-1)x1.111
=2222-1.111=2220.889
原式=(2000+200+20+2)-(1+0.1+0.01+0.001)=2222-1.111=2220.889
=1999+1.999+199.9+19.99=2000.999+199.9+19.99=2200.899+19.99=2220.889
1999+199.9+19.99+1.999 简算
1999+199.9+19.99+1.999+0.1999
1999+199.9+19.99+1.999=?
1999+199.9+19.99+1.999+0.1999
巧算 1.999+19.99+199.9+1999
简便运算:1999+199.9+19.99+1.999+2.111
1999+199.9+19.99+1.999+2.111简便运算
1999+199.9+19.99+1.999=(简便运算)
1999*3.14+199.9*31.4+19.99*314 简算
简算1999+199.9+19.99+1.999+0.1999
巧算∶1.999+19.99+199.9+1999
1999+199.9+19.9+1.9=
简便计算、、、、、、、1999+199.9+19.99+1.999 请简便计算、、、、、、、1999+199.9+19.99+1.999 请学霸帮忙
19.99*37+1999*0.82-1999.9*1.9=
1999+199.9+19.99+1.999+2.111怎么算简便
1.999+19.99+199.9+1999(用简便方法计算)
19.99 ×36 -199.9× 1,8 +1999× 0,82
1999*3.14+199.9*31.4-19.99*314的简便运算