用递等式计算,能简便的要简便计算 8.3-2.4×1.5 23.4÷7.8+2.1 2.5×6

2025-01-21 08:50:38
推荐回答(1个)
回答1:

(1)8.3-2.4×1.5,
=8.3-3.6,
=4.7;

(2)23.4÷7.8+2.1,
=3+2.1,
=5.1;

(3)2.5×6.3+2.5×3.7,
=2.5×(6.3+3.7),
=2.5×10,
=25;

(4)1.25×2.3×0.8,
=1.25×0.8×2.3,
=1×2.3,
=2.3.