The calculation is based on the formula, 100x 1.80.5x 50 5.39 + 1 and 2 / 7 + 4.61 + 5 / 7 Take off

The calculation is based on the formula, 100x 1.80.5x 50 5.39 + 1 and 2 / 7 + 4.61 + 5 / 7 Take off

100x 1.8%
=100x1.8%
=1.8
0.5x 50%
=0.5x50%
=0.25
5.39 + 1 and 2 / 7 + 4.61 + 5 / 7
=(5.39 + 4.61) + (1 and 2 / 7 + 5 / 7)
=10+2
=12

The first one: 3.6 minus 3.6 times 0.5
Second: 5.8 times 5.8 plus 0.58 times 42 plus 58
OK, 20 more. 20 more

The first: 3.6-3.6 × 0.5
=3.6×(1-0.5)
=3.6×0.5
=1.8
The second: 5.8 × 5.8 + 0.58 × 42 + 58
=5.8×5.8+5.8×0.1×42+58
=5.8×5.8+5.8×4.2+58
=5.8×(5.8+4.2)+58
=5.8×10+58
=58+58
=116

That is to say, the formula of off formula calculation!
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Calculate the following questions with decimals
1、8km－5km60m
2. 4 yuan, 8 Jiao, 2 Fen - 3 yuan, 5 jiao
3、2t9㎏＋450㎏

1、8km－5km60m=8km-5.06km=2.94km
2. 4 yuan, 8 Jiao, 2 Fen - 3 yuan, 5 jiao = 4.82 yuan - 3.5 yuan = 1.32 yuan
3、2t9㎏＋450㎏=2.009t-0.45t=1.559t

Use decimals to calculate the following question: 50 yuan-18 yuan, 7 Jiao and 8 Fen=

31.22

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