5 +10+15+20+25写成乘法算式
=(5+25)x5/2
=30x5/2
=75
都是神人啊，我都看不懂
5+2×5+3×5+4×5+5×5=5(1+2+3+4+5)=75
5 +10+15+20+25写成乘法算式
5 +10+15+20+25写成乘法算式
=(5+25)x5/2
=30x5/2
=75
都是神人啊，我都看不懂
5+2×5+3×5+4×5+5×5=5(1+2+3+4+5)=75
5 +10+15+20+25写成乘法算式
=(5+25)x5/2
=30x5/2
=75
都是神人啊，我都看不懂
5+2×5+3×5+4×5+5×5=5(1+2+3+4+5)=75