Question

a. 15,78 + 74,3 – 21,3 + 6,22

b. 47,98 – 2,36 – 7,64 + 8,02

c.  3,5 + 4,5 + 5,5 + 6,5 – 1,2 – 1,8 – 1,4 – 1,6

d. 199,7 x 7 +19,97x 29 + 19,97

giúp mink với

Answer 1

a: =(15,78+6,22)+(74,3-21,3)

=22+53

=75

b: \(=\left(47.98+8.02\right)-\left(2.36+7.64\right)\)

=56-10

=46

c: \(=\left(3.5+6.5\right)+\left(4.5+5.5\right)-\left(1.2+1.8\right)-\left(1.4+1.6\right)\)

=10+10-3-3

=7+7=14

d: \(=19.97\cdot70+19.97\cdot29+19.97\)

\(=19.97\cdot100=1997\)

Answer 2

`a// 15,78+74,3-21,3+6,22`

`=(15,78+6,22)+(74,3-21,3)`

`=22+53=75`

`b// 47,98-2,36-7,64+8,02`

`=(47,98+8,02)-(2,36+7,64)`

`=56-10=46`

`c// 3,5+4,5+5,5+6,5-1,2-1,8-1,4-1,6`

`=(3,5+6,5)+(4,5+5,5)-(1,2+1,8)-(1,4+1,6)`

`=10+10-3-3=20-3-3=17-3=14`

`d// 199,7xx7+19,97xx29+19,97`

`=19,97xx70+19,97xx29+19,97`

`=19,97xx(70+29+1)=19,97xx100=1997`