巧算0.991+1.992+2.993+3.994

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巧算0.991+1.992+2.993+3.994
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巧算0.991+1.992+2.993+3.994
巧算0.991+1.992+2.993+3.994

巧算0.991+1.992+2.993+3.994
0.991+1.992+2.993+3.994
=1-0.009+2-0.008+3-0.007+4-0.006
=(1+2+3+4)-(0.009+0.008+0.007+0.006)
=10-0.015*2
=10-0.03
=9.97

0.991+1.992+2.993+3.994
=(1-0.009)+(2-0.008)+(3-0.007)+(4-0.006)
=(1+2+3+4)-(0.009+0.008+0.007+0.006)
=10-0.03
=9.97

1-.009+(2-.008)+(3-.007)+(4-.006)
=10-(.009+.008+.007+.006)
=10-2*(.008+.007)
=10-0.03
=9.97

1+2+3+4-0.009-0.008-0.007-0.006
=10-0.03=9.97

把0.991变为1-0.009
把1.992变为2-0。008
把2.993变为3-0.007
把3.994变为4-0.006
1+2+3+4-0.03=9.97
答案是9.97

巧算0.991+1.992+2.993+3.994 巧算! 巧算, 计算：1.992-1.98*1.99+0.992 (1.992+19.92+199.2)/0.111 简便计算 1.2+1.92+1.992+.+1.99.+1.99..怎样计算 1.991+1.992+1.993+...+2.001+2.002+2.003 0.991^5的近似值(精确到0.001)是多少 0.991^5精确到0.01的近似值是 简便运算 2008+200.8+20.08+200.8+1992+199.2+19.92+1.992 2008+200.8+20.08+2.008+199.2+19.92+1.992= (2008+200.8+20.08+2.008+1992+199.2+19.92+1.992)怎么写? 7、巧算? 这题咋做,巧算 巧算?… 巧算,(写纸上) 2009＋200.9＋20.09＋2.009＋991＋99.1＋9.91＋0.991 0.82×32+3.2-0.32×91巧算!!!!!!!!!!!!巧算