用你喜欢的方法进行计算. 78-4.5+22-451/2 11×11×11-11×11-10 1/4×(4.85÷5/18-3.6+6.15×33/5)

问题描述:

用你喜欢的方法进行计算.
78-4.5+22-45

1
2

11×11×11-11×11-10       
1
4
×(4.85÷
5
18
-3.6+6.15×3
3
5

(1)78-4.5+22-45

1
2

=78-4.5+22-45.5
=(78+22)-(4.5+45.5)
=100-50
=50
(2)11×11×11-11×11-10       
=11×11×(11-1)-10
=11×11×10-10
=10×(11×11-1)
=10×(121-1)
=10×120
=1200
(3)
1
4
×(4.85÷
5
18
-3.6+6.15×3
3
5

=
1
4
×(4.85×3.6-3.6+6.15×3.6)
=
1
4
×3.6×(4.85-1+6.15)
=0.9×10
=9