问题
解答题
用递等式计算,能简便的简便计算:
7.28-(1.28+0.25)
0.64×6.4-O.64×5.4
26.18-(48.6÷18)×3.5
9.4×[O.96÷(5.4÷0.9)].
答案
(1)7.28-(1.28+0.25),
=7.28-1.28-0.25,
=6-0.25,
=5.75;
(2)0.64×6.4-O.64×5.4,
=0.64×(6.4-5.4),
=0.64×1,
=0.64;
(3)26.18-(48.6÷18)×3.5,
=26.18-2.7×3.5,
=26.18-9.45,
=16.73;
(4)9.4×[O.96÷(5.4÷0.9)],
=9.4×[0.96÷6],
=9.4×0.16,
=1.504.