Răspuns:
1. 10.000-6×4:3:8= 10.000-24:3:8
=10.000-8:8
=10.000-1
=9999
2. 10×(42:7:2:3)×10= 10×(6:2:3)×10
=10×(3:3)×10
=10×1×10
=10×10
=100
3. 100:(2+8×7+42)×9=100:(2+56+42)×9
=100:(58+42)×9
=100:100×9
=1×9
=9
4. 7000-4×2×4:8+1396=7000-8×4:8+1396
=7000-32:8+1396
=7000-4+1396
=6996+1396
=8392
5. (3×3×3):(4×4:8×9:6)=(9×3):(16:8×9:6)
=27:(2×9:6)
=27:(18:6)
=27:3
=9
6. 1000-(7+3×9+66):10=1000-(7+27+66):10
=1000-(34+66)
=1000-100
=900
7. 6-6×(8×8-58):9+2888=6-6×(64-58):9+2888
=6-6×6:9+2888
=6-36:9+2888
=6-4+2888
=2+2888
=2900
8. 7777-63:(54:6)×(49:7:7)×10=7777-63:9×(7:7)×10
=7777-7×1×10
=7777-7×10
=7777-70
=7707
9. 5000+18:(36:9×6:8)×8+3452=5000+18:(4×6:8)×8+3452
=5000+18:(24:8)×8+3452
=5000+18:3×8+3452
=5000+6×8+3452
=5000+48+3452
=5048+3452
=5500
