把10+20+30+40+50+填入
荣霍华277410+20+30+40...+80+90+100怎样用简便方式算出它们的和 -
谷疮省19420204540 ______ 10+100+(20+90)+(30+80)+(40+70)+(50+60)=110*5=550
荣霍华277410+20+30+40.+80+90+100怎样用简便方式算出它们的和 -
谷疮省19420204540 ______[答案] 10+100+(20+90)+(30+80)+(40+70)+(50+60)=110*5=550
荣霍华277410+ 20 +30 +40 +50+ 60 +70乘法怎样算 -
谷疮省19420204540 ______[答案] 分析:10+70=80=40*2;20+60=80;30+50=8010+ 20 +30 +40 +50+ 60 +70=40*7=280
荣霍华2774思考题.你能用乘法计算吗?10+20+30+40+50+60+70 -
谷疮省19420204540 ______[答案] 10+20+30+40+50+60+70=80*3+40=280
荣霍华277410+20+30+40+50+60+70+80+90+100+120+130+140+150+160+170+180+190+200 -
谷疮省19420204540 ______[答案] 2000
荣霍华277410+20+30+40...90+100怎么算? -
谷疮省19420204540 ______[答案] =(10+100)*10/2=550
荣霍华2774 计算下面各题:①100+10+20+30 ②100 - 10 - 20 - 30 ③100 - 30+10. -
谷疮省19420204540 ______[答案] ①100+10+20+30 =100+(10+20+30), =100+60, =160; ②100-10-20-30 =100-(10+20+30), =100-60, =40; ③100-30+10 =70+10, =80.
荣霍华277410+20+30+40+50+60+70+80+90+100=?为什么? -
谷疮省19420204540 ______[答案] 10+20+30+40+50+60+70+80+90+100 =(10+100)*10/2 =110*5 =550
荣霍华277410+20+30+40+50=()*()的规律 -
谷疮省19420204540 ______[答案] 2n*5= (n=1.2.3.)