2.4减2.4乘4/7减3/7(简算)
问题描述:
2.4减2.4乘4/7减3/7(简算)
答
2.4减2.4乘4/7减3/7
=2.4×(1-4/7)-3/7
=2.4×3/7-3/7
=(2.4-1)×3/7
=1.4×3/7
=0.6