Question

Bài 1.Thực hiện phép tính 

a,17.85+15+17-120

b,37.24+37.76+63.79+21.63

c,69.113-27.69+69.14+31

 

Answer 1

a,17.85+15+17-120

= 17 . (85 + 15) - 120

= 1700 - 120 

= 1580

Answer 2

b,37.24+37.76+63.79+21.63

=37.(24+76)+63.(79+21)

=37.100+63.100

=100.(37+63)

=100.100 =10000

Answer 3

a,17.85+15+17-120 =1445+15-17-120=1323

b,37.24+37.76+63.79+21.63=37(24+76) + 63(79+21)=37.100+63.100=100(37+63)=100.100=10000

c,69.113-27.69+69.14+31=69(113-27+14)+31=69.100+31=6900+31=6931

@Huyền

Answer 4

c) 69.113 - 27.69 + 69.14 + 31

=  69.(113 - 27 + 14) +31

=  69.100 + 31

= 6931