1 |
3 |
1 |
6 |
5 |
12 |
=
1 |
3 |
13 |
6 |
5 |
12 |
=4+26-5,
=25;
(2)[47?(18.75?1÷
8 |
15 |
6 |
25 |
=[47-(18.75-
15 |
8 |
56 |
25 |
=[47-(18.75×
56 |
25 |
56 |
25 |
=[47-(42-4.2)]÷0.46,
=[47-37.8]÷0.46,
=9.2÷0.46,
=20;
(3)75%×1.375+5.625×75%+0.75
=0.75×1.375+5.625×0.75+0.75,
=(1.375+5.625+1)×0.75,
=8×0.75,
=6;
(4)77×13+225×999+510.
=77×(10+3)+225×(1000-1)+510,
=77×10+77×3+225×1000-225+510,
=770+231+225000-225+510,
=226286.