计算3.3x3.4+3.4x3.5+3.5x3.6+3.6x3.7
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计算3.3x3.4+3.4x3.5+3.5x3.6+3.6x3.7
1.计算:199519961997--------------------------------------19961996x19961996-19961995x199619972.计算:1/2 1/3 1/4 1/1997—— + ————————— + ———————— +.+————————1+1/2 (1+1/2)(1+1/3) (1+1/2)(1+1/3)(1+1/4) (1+1/2)(1+1/3).(1+1/1997)3.计算:1 1996
1.计算:199519961997--------------------------------------19961996x19961996-19961995x199619972.计算:1/2 1/3 1/4 1/1997—— + ————————— + ———————— +.+————————1+1/2 (1+1/2)(1+1/3) (1+1/2)(1+1/3)(1+1/4) (1+1/2)(1+1/3).(1+1/1997)3.计算:1 1996
3.3x3.4+3.4x3.5+3.5x3.6+3.6x3.7
=3.4x(3.3+3.5)+3.6x(3.5+3.7)
=3.4x6.8+3.6x(6.8+0.4)
=6.8x(3.4+3.6)+3.6x0.4
=6.8x7+3.6x0.4
=47.6+1.44
=49.04
=3.4x(3.3+3.5)+3.6x(3.5+3.7)
=3.4x6.8+3.6x(6.8+0.4)
=6.8x(3.4+3.6)+3.6x0.4
=6.8x7+3.6x0.4
=47.6+1.44
=49.04
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