60 square decimeters. How many square meters

60 square decimeters. How many square meters

60 square meters = 6000 square decimeters

(28 + 8.5) / 15 is calculated by a simple method

Original formula = (30-2 + 1 + 7.5) / 15
=30/15+6.5/15
=2+65/150
=2 and 13 / 30
=73/30

28 times 11111 and 99999 times 8 are calculated by a simple method

Take 30 * 11111-2 * 11111 + 100000 * 8-2 * 8 = 333330-22222 + 800000-16

A simple way to multiply from 1 to 10
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10, the answer is 3628800, the result is this, but how to calculate the simple method? For example: 125 * (8 * 6)
=(125*8)*6
=1000*6
=6000
Calculation by using the law of multiplication
Don't say it's the easiest way to use a calculator. You have to say the process
=

2*5*10*1*（3*4*6*7*8*9）
=100*(3*2*2*2*3*7*2*2*2*3*3)
=700*(3*3*3*3)*(2*2*2*2*2*2)
=700*81*64
=44800*(80+1)
=3584000+44800
=3628800

A simple method of 45 times 44 / 43 and 43 times 44 / 43

45×43/44
=（44+1）×43/44
=44×43/44+1×43/44
=43+43/44
=43 and 43 / 44
43×43/44
=（44-1）×43/44
=44×43/44-1×43/44
=43-43/44
=42+1-43/44
=42+1/44
=42 and 1 / 44

Add brackets to the following formula to make the equation hold. 5 + 7 × 8 + 12 △ 4-2 = 755 + 7 × 8 + 12 △ 4-2 = 20
1、5+7×8+12÷4－2=75 2、5+7×8+12÷4－2=20

1 question
5+7×(8+12)÷(4-2)=75
5+7×(8+12)÷(4-2)
=5+7×20÷2
=5+140÷2
=5+70
=75
2 questions
5+(7×8+12)÷4-2=20
5+(7×8+12)÷4-2
=5+(56+12)÷4-2
=5+68÷4-2
=5+17-2
=22-2
=20

Add brackets to the following formula to make the equation hold. ① 7 × 9 + 12 △ 3-2 = 75; ② 7 × 9 + 12 △ 3-2 = 47; ③ 7 × 9 + 12 △ 3-2 = 23

7 * 9 + 12 / 3-2 = 24 add brackets to make the equation hold
4 answers plus 100 points

（1）7×[（9+12）÷3]-2=47；
（2）7×9+12÷（3-2）=75；
（3）（7×9+12）÷3-2=23；
（4）7×[（9+12）÷3-2]=35

7 × 9 + 12 △ 3-2 = 24

（7×9+12）÷3-2=23
7×[(9+12)÷3-2]=35
7×[(9+12)÷3]-2=47
7×9+12÷（3-2）=75
7×（9+12÷3）-2=89

7 × 9 + 12 △ 3 = 91

7x[9+（12÷3）]=91