1991+199.1+19.91+1.991.-19
编辑: admin 2017-12-03
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4
1991+199.1+19.91+1.991,
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009),
=(2000+200+20+2)-(9+0.9+0.09+0.009),
=2222-9.999,
=2222-(10-0.001),
=2222-10+0.001,
=2212.001.
类似问题
类似问题1:1991+199.1+19.91+1.991.[数学科目]
1991+199.1+19.91+1.991,
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009),
=(2000+200+20+2)-(9+0.9+0.09+0.009),
=2222-9.999,
=2222-(10-0.001),
=2222-10+0.001,
=2212.001.
类似问题2:1991+199.1+19.91+1.991.[数学科目]
1991+199.1+19.91+1.991,
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009),
=(2000+200+20+2)-(9+0.9+0.09+0.009),
=2222-9.999,
=2222-(10-0.001),
=2222-10+0.001,
=2212.001.
类似问题3:1991+199.1+19.91+1.991.[数学科目]
1991+199.1+19.91+1.991,
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009),
=(2000+200+20+2)-(9+0.9+0.09+0.009),
=2222-9.999,
=2222-(10-0.001),
=2222-10+0.001,
=2212.001.
类似问题4:0.91/0.8+1.25*0.19怎么用简便方法计算(要过程)[数学科目]
0.91/0.8+1.25*0.19=0.91*1.25+1.25*0.19=1.1+1.25=1*1.25+0.1*1.25=1.375
类似问题5:1991+199.1+19.91+1.991.[数学科目]
1991+199.1+19.91+1.991,
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009),
=(2000+200+20+2)-(9+0.9+0.09+0.009),
=2222-9.999,
=2222-(10-0.001),
=2222-10+0.001,
=2212.001.