Question

4×四分之三+75％×7-0.75简便计算

Answer 1

4×四分之三+75％×7-0.75简便计算
=4× 3/4 + 3/4 ×7 - 3/4 x1
= 3/4 x ( 4 + 7 -1 )
= 3/4 x 10
= 3/2 x 5
= 2 分之15

Answer 2

4×四分之三+75％×7-0.75
=(4+7-1)*0.75
=10*0.75
=7.5

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可以帮我讲解一下吗？我有点不明白