分析 (1)根據(jù)減法的性質(zhì)進行簡算;
(2)先算除法,再算加法;
(3)先算減法,再算括號里面的除法,最后算括號外面的除法;
(4)根據(jù)乘法分配律進行簡算;
(5)根據(jù)乘法交換律進行簡算;
(6)根據(jù)加法交換律和結(jié)合律進行簡算.
解答 解:(1)8-3.25-2.75
=8-(3.25+2.75)
=8-6
=2;
(2)0.63+96÷3.2
=0.63+30
=30.63;
(3)0.42÷[(3.2-0.5)÷9]
=0.42÷[2.7÷9]
=0.42÷0.3
=1.4;
(4)0.67×101-0.67
=0.67×(101-1)
=0.67×100
=67;
(5)1.25×0.89×8
=1.25×8×0.89
=10×0.89
=8.9;
(6)1.56+6.3+3.44+3.7
=(1.56+3.44)+(6.3+3.7)
=5+10
=15.
點評 考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學(xué)的運算定律簡便計算.