①1114×719-719×214+719②1983×668+6483×666③0.25×32×0.125④16+112+120+130+142+156+172+190+1110.-数学
②
19 |
83 |
64 |
83 |
=
19 |
83 |
64 |
83 |
=
19 |
83 |
19 |
83 |
64 |
83 |
=(
19 |
83 |
64 |
83 |
19 |
83 |
=1×666+
38 |
83 |
=666
38 |
83 |
③0.25×32×0.125,
=0.25×(4×8)×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;
④
1 |
6 |
1 |
12 |
1 |
20 |
1 |
30 |
1 |
42 |
1 |
56 |
1 |
72 |
1 |
90 |
1 |
110 |
=
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
5×6 |
1 |
6×7 |
1 |
7×8 |
1 |
8×9 |
1 |
9×10 |