计算:1.(x+1)×(x+2)-x(x-1) 2.9×11×101×10001
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计算:1.(x+1)×(x+2)-x(x-1)2.9×11×101×10001计算:1.(x+1)×(x+2)-x(x-1)2.9×11×101×10001计算:1.(x+1)×(x+2)-x(x-1
计算:1.(x+1)×(x+2)-x(x-1) 2.9×11×101×10001
计算:1.(x+1)×(x+2)-x(x-1) 2.9×11×101×10001
计算:1.(x+1)×(x+2)-x(x-1) 2.9×11×101×10001
1.(x+1)×(x+2)-x(x-1)
=x²+2x+x+2-x²+x
=4x+2
2.9×11×101×10001
=(10-1)(10+1)×101×10001
=(100-1)×(100+1)×10001
=(10000-1)(10000+1)
=100000000-1
=99999999
1. (x+1)×(x+2)-x(x-1)
=x²+3x+2 -x²+3x-1
=6x+1
2.9x11×101×10001
=9×11×101×10001
=(10-1)×(10+1)×101×10001
=(100-1)×(100+1)×10001
=(10000-1)×(10000+1)
=(100000000-1)
=99999999
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