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jdiel14
12.08.2020 •
Mathematics
Estimate the following sum by clustering. 14.2 + 15.51 + 14.99 + 15.8
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Ответ:
Below
Step-by-step explanation:
Notice that:
● 14.2 = 14+0.2
● 15.8 = 15 +0.8
● 0.8+0.2 = 1
So:
● 14.2 +15.8 = 14+15 +0.2+0.8
● 14.2+15.8 = 14+1+15 = 15+15 = 30 (1)
■■■■■■■■■■■■■■■■■■■■■■■■■■
Notice that:
● 14.99 = 14+0.99
● 15.51 = 15+0.50+0.01
● 0.99 + 0.1 = 1
● 14.99+15.51 = 14+0.99+0.5+0.01
● 14.99+15.51= 14 + 1 +0.5
● 14.99+15.51 = 15+0.5 (2)
●(1)+(2) = 30 +15+0.5 = 45+0.5
So the total sum is 45.5 (45+0.5)
Ответ:
60
Step-by-step explanation:
14.2 + 15.51 + 14.99 + 15.8
= 14.2 + 15.8 + 15.51 + 14.99
= 30 + about 30.5
= 60.
Ответ:
sorry just here for the points :(
Step-by-step explanation: