10×11/1+11×12/1+12×13/1和2×3/1+3×4/1————99×100/1各等于几?
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![10×11/1+11×12/1+12×13/1和2×3/1+3×4/1————99×100/1各等于几?](/uploads/image/z/942496-16-6.jpg?t=10%C3%9711%2F1%2B11%C3%9712%2F1%2B12%C3%9713%2F1%E5%92%8C2%C3%973%2F1%2B3%C3%974%2F1%E2%80%94%E2%80%94%E2%80%94%E2%80%9499%C3%97100%2F1%E5%90%84%E7%AD%89%E4%BA%8E%E5%87%A0%3F)
10×11/1+11×12/1+12×13/1和2×3/1+3×4/1————99×100/1各等于几?
10×11/1+11×12/1+12×13/1和2×3/1+3×4/1————99×100/1各等于几?
10×11/1+11×12/1+12×13/1和2×3/1+3×4/1————99×100/1各等于几?
10×11/1+11×12/1+12×13/1
=10/1-11/1+11/1-12/1+12/1-13/1
=10/1-13/1
=130/3
2×3/1+3×4/1————99×100/1
=2/1-3/1+3/1-4/1+.+99/1-100/1
=2/1-100/1
=100/49