你好:
10×10-9×9+8×8-7×7+6×6-5×5+4×4-3×3+2×2-1×1
= 100 - 81 + 64 - 49 + 36 - 25 + 16 - 9 + 4 -1
=100 + (64 + 36 ) + (16 + 4) - (81 + 49) -(25 + 9 + 1)
=100 + 100 + 20 - 130 - 35
=90- 35
=55
=100-81+64-49+36-25+16-9+4-1
=19+15+11+7+3
=30+15+10
=55