用自己喜歡的方法計算.
(1)1.73+1.73×3.5+5.5×1.73
(2)3.5×[(1-0.05)÷1.9]
(3)68×0.11+8.9×6.8
(4)8.88÷3.7×1.25.
解:(1)1.73+1.73×3.5+5.5×1.73,
=(1+3.5+5.5)×1.73,
=10×1.73,
=17.3;
(2)3.5×[(1-0.05)÷1.9],
=3.5×[0.95÷1.9],
=35×0.5,
=17.5;
(3)68×0.11+8.9×6.8,
=6.8×1.1+8.9×6.8,
=6.8×(1.1+8.9),
=6.8×10,
=68;
(4)8.88÷3.7×1.25,
=8.88×1.25÷3.7,
=(8+0.8+0.08)×1.25÷3.7,
=(8×1.25+0.8×1.25+0.08×1.25)÷3.7,
=(10+1+0.1)÷3.7,
=11.1÷3.7,
=3.
分析:(1)運用乘法分配律簡算;
(2)先算小括號內(nèi)的,再算中括號內(nèi)的,最后算括號外的;
(3)原式變?yōu)?.8×1.1+8.9×6.8,運用乘法分配律簡算;
(4)此題屬于同級運算,可先算乘法,再算除法.
點評:此題考查了小數(shù)的四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算律簡便計算.