下面各题怎样算简便就怎样算. 24.68+(6.35-4.68) 82.9-13.68-2.32 4.2×99+4.2 48×1.25 2.

2025-06-20 21:57:37
推荐回答(1个)
回答1:

(1)24.68+(6.35-4.68),
=24.68-4.68-6.35,
=20-6.35,
=13.65;

(2)82.9-13.68-2.32,
=82.9-(13.68+2.32),
=82.9-16,
=66.9;

(3)4.2×99+4.2,
=4.2×(99+1),
=4.2×100,
=420;

(4)48×1.25,
=6×(8×1.25),
=6×10,
=60;

(5)2.5÷(0.5×0.25),
=2.5÷0.5÷0.25,
=5÷0.25,
=20;

(6)0.065×430+65×0.57,
=65×(0.43+0.57),
=65×1,
=65.