Two thirds × () = one and two fifths × () 2.5 × () = 1 How to fill in

Two thirds × () = one and two fifths × () 2.5 × () = 1 How to fill in

Two thirds × (3 / 2) = one and two fifths × (5 / 7) = 2.5 × (0.4) = 1

(two fifths - two fifths / 2) * five thirds

(two fifths - two fifths / 2) * five thirds
=(2 / 5-1 / 5) * 5 / 3
=1 / 5 * 5 / 3
=1 / 3

Simple calculation method of two thirds × six and four fifths × thirty six and thirty five × thirty five

2 / 3 × 6 / 5 × 36 / 35 × 35 = (2 / 3) × (6 + 4 / 5) × (35 / 36) × 35 = 4165 / 27 = 154 / 27 / 7

(3.6 × 4.5) / (three fifths × 0.9) simple calculation

(3.6 × 4.5) / (three fifths × 0.9)
=（3.6×4.5）÷（0.6×0.9）
=(3.6÷0.6)x(4.5÷0.9)
=6x5
=30