(7\5 − 3\7) ⋅ 4\9.
= 7/5 × 4/9 - 3/7 × 4/9
= 28/45 - 3/7 × 4/9
= 28/45 - 1/7 × 4/3
= 28/45 - 4/21
= 136/315
(7/5-3/7)*4/9
7/5-3/7=49/35-15/35=34/35
34/35*4/9=136/315
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(7\5 − 3\7) ⋅ 4\9.
= 7/5 × 4/9 - 3/7 × 4/9
= 28/45 - 3/7 × 4/9
= 28/45 - 1/7 × 4/3
= 28/45 - 4/21
= 136/315
(7/5-3/7)*4/9
7/5-3/7=49/35-15/35=34/35
34/35*4/9=136/315