Question

0.59×7.2-0.72×3.9简便计算

0.59×7.2-0.72×3.9简便计算

Answer 1

原式
=0.59x7.2-7.2x0.39
=(0.59-0.39)x7.2)
=0.2x7.2
=1.44

或者
=5.9x0.72-0.72x3.9
=(5.9-3.9)x0.72
=2x0.72
=1.44

供参考。