2.4减2.4乘4/7减3/7(简算)

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2.4减2.4乘4/7减3/7(简算)
2.4减2.4乘4/7减3/7(简算)

2.4减2.4乘4/7减3/7(简算)
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

2.4-2.4×4/7-3/7
=2.4×(1-4/7)-3/7
=2.4×(3/7)-3/7
=(2.4-1)×(3/7)
=1.4×(3/7)
=0.6

无奈啊,很多小数点啊

2.4-2.4•4/7-3/7
=2.4*(1-4/7)-3/7
=2.4*3/7-3/7
=(2.4-1)*3/7
=1.4*3/7
=0.2*3
=0.6