1x2÷1＋2x3÷1＋3x4÷1＋4x5÷1＋5x6÷1等于?
问题描述：
1x2÷1＋2x3÷1＋3x4÷1＋4x5÷1＋5x6÷1等于?
答
=1*(2/1)+2*(3/1)+3*(4/1)+4*(5/1)+5*(6/1)=1*2+2*3+3*4+4*5+5*6=2+6+12+20+30=70
答
=2+6+12+20+30
=70
答
=2+6+12+20+30=70
答
70
答
70.
等于2+6+12+20+30
答
2+6+12+20+30=70
答
1x2÷1＋2x3÷1＋3x4÷1＋4x5÷1＋5x6÷1
=1x2＋2x3＋3x4＋4x5＋5x6
=2*（3+1）+3x4＋4x5＋5x6
=4*（2+3）＋4x5＋5x6
=（4+4+6）*5
=14*5
=70
答
错了
1÷(1x2)+1÷(2x3)+12/(3x4)+1÷(4x5)+1÷(5x6)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
答
=2+6+12+20+30
=70