Simple algorithm of 12.5 × 4.5 + 4.5 × 12.5 + 12.5?

Simple algorithm of 12.5 × 4.5 + 4.5 × 12.5 + 12.5?

12.5×4.5＋4.5×12.5＋12.5
=12.5×（4.5+4.5+1）
=12.54×10
=125

Simple algorithm: 4:7 5-2:12 7 + 5:7 2-4:12 5

4.7 5-2.12 7 + 5.7 2-4.12 5
=4+5/7-2-7/12+5+2/7-4-5/12
=4-4+5-2+5/7+2/7-5/12-7/12
=3+(5/7+2/7)-(5/12+7/12)
=3+1-1
=3

A simple calculation method of 2.4 · 12.5

2.4×12.5
=(0.3×8)×12.5
=0.3×(8×12.5)
=0.3×100
=30

A simple calculation method of 2.5 × 12.5 × 32-614
How to calculate 2.5 × 12.5 × 32-614 with simple calculation,

2.5×12.5×32-614
=2.5×4×12.5×8-614
=10×100-614
=1000-614
=386

How to solve 1.5x △ 1.5-0.25) - x = 10,

1.5x divided by 1.25-x = 10
1.2x-x=10
0.2x =10
x=50

1.5X=(1.5-0.25)(X+10)

1.5x=1.25（x+10)
1 .5x=1.25x+12.5
0.25x=12.5
x=50

5*(√x/5)+0.5(√20x) +1.25*(√4/5x)
The direct results can also be simplified

5*(√x/5)+0.5(√20x) +1.25*(√4/5x)
=√(5²*x/5)+√(0.5²*20x) +√[(5/4)²*4/5x]
=√5x+√5x +√(5/4x)
=2√5x +(1/2)√5x
=(5/2)√(5x)

5/4x+6/5x=25 1.28÷x=0.32 3 /4+2/1=5/4
The last one is wrong, 3 / 4 + 1 / 2 = 5 / 4

5/4x+6/5x=25
49/20x=25
x=500/49
1.28÷x=0.32
0.32x=1.28
x=1.28÷0.32
x=4
3/4+2/1=5/4
The title is wrong

3.5x+x=32.4 0.6x（x+0.6)=0.6 25%x-20%=1.8 20%x÷15%=2

3.5x+x=32.4
4.5x=32.4
x=32.4÷4.5
x=7.2
0.6x（x+0.6)=0.6
0.6x+0.36=0.6
0.6x=0.6-0.36
0.6x=0.24
x=0.24÷0.6
=0.4
25%x-20%=1.8
0.25x-0.2=1.8
0.25x=1.8+0.2
0.25x=2
x=2÷0.25
x=8
20%x÷15%=2
0.2x÷0.15=2
0.2x=2×0.15
0.2x=0.3
x=0.3÷0.2
x=1.5

How to solve 0.5x = 5.25

0.5x=5.25
x=5.25÷0.5
x=10.5