72 * 2.07-1.8 * 3.6 and 6.8 * 16.8 + 19.3 * 3.2

72 * 2.07-1.8 * 3.6 and 6.8 * 16.8 + 19.3 * 3.2

72*2.07-1.8*3.6 =3.6x20x2.07-1.8x3.6=3.6x(41.4-1.8)=3.6x(40-0.4)=3.6x40-3.6x0.4=144-1.44=142.566.8*16.8+19.3*3.2=6.8x16.8+(16.8+2.5)*3.2=6.8x16.8+16.8x3.2+2.5x3.2=16.8x(6.8+3.2)+2.5x4x0.8=16.8x10+10x0...

84 and 1 / 2 △ 14 + 16 and 1 / 2 × 1 / 14 - (1-13 / 14)

84 and 1 / 2 △ 14 + 16 and 1 / 2 × 1 / 14 - (1-13 / 14)
=84 and 1 / 2 × 1 / 14 + 16 and 1 / 2 × 1 / 14-1 / 14
=1 / 4 × (84 + 1 / 2 + 16 + 1 / 2-1)
=1/4×100
=25

Math problem (): 35 = 4 / 10 = 6 △ () = 2 () / 25 = ()%
Great Xia,

(14):35=4/10=6÷(15)=(10)/25=(40)%
4/10=2/5=6/15=10/25=14/35