分析:(1)(4)可根據(jù)加法交換律計算;
(2)可根據(jù)一個數(shù)減兩個數(shù),等于用這個數(shù)減去這兩個數(shù)的和的減法性質(zhì)計算;
(3)可根據(jù)加法交換律及結(jié)合律計算;
(5)可根據(jù)一個數(shù)減兩個數(shù)的和,等于用這個數(shù)分別減去這兩個數(shù)的減法性質(zhì)計算;
(6)可將式中6.99變?yōu)?-0.01計算.
解答:解:(1)0.16+14.95+5.84
=0.16+5.84+14.95
=6+14.95
=20.95
(2)13.74-7.28-5.72
=13.74-(7.28+5.72)
=13.74-13
=0.74
(3)1.59+3.3-0.59+6.7
=1.59-0.59+(3.3+6.7)
=1+10
=11
(4)7.02-4.5+0.98
=7.02+0.98-4.5
=8-4.5
=3.5
(5)21.36-(4.36+0.98)
=21.36-4.36-0.98
=17-0.98,
=16.02
(6)54.31-6.99
=54.31+7-0.01
=61.31-0.01
=61.3
點評:本題考查了學(xué)生對于加法運算定律的理解與應(yīng)用.