脱式计算(能简算的要简算)0.75×4×0.25×4 9.6+9.9×99

2024-11-08 18:36:14
推荐回答(2个)
回答(1):

(1)0.75×4×0.25×4,
=(0.75×4)×(0.25×4),
=3×1,
=3;

(2)9.6+9.9×99,
=(9.9-0.3)+9.9×99,
=9.9+9.9×99-0.3,
=9.9×(1+99)-0.3,
=9.9×100-0.3,
=990-0.3,
=989.7;

(3)6.3×10.1,
=6.3×(10+0.1),
=6.3×10+6.3×0.1,
=63+0.63,
=63.63;

(4)15.58÷8.2-0.72,
=1.9-0.72,
=1.18;

(5)4.536÷0.8÷14,
=5.67÷14,
=0.405;

(6)2.8×3.6+1.4×2.8,
=2.8×(3.6+1.4),
=2.8×5,
=14.

回答(2):

0.75×4×2.5×4=3×0.25×4×0.25×4=3×1×1=3