用递等式计算,怎样算简便就怎样算:①8.4×0.26+0.74②23.4÷7.8-2.1③0.25×13.2×4④2.65×1.7+13.5×

2025-05-16 13:06:23
推荐回答(1个)
回答(1):

①8.4×0.26+0.74,
=2.184+0.74,
=2.924;

②23.4÷7.8-2.1,
=3-2.1,
=0.9;

③0.25×13.2×4,
=(0.25×4)×13.2,
=1×13.2,
=13.2;

④2.65×1.7+13.5×0.17,
=2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;

⑤0.78÷0.25×4,
=3.12×4,
=12.48;

⑥0.8×(3.2-3.2÷1.6),
=0.8×(3.2-2),
=0.8×1.2,
=0.96.