7.5×2.3×2.3x3.5-2.3这道题怎么巧算？(7.50.271.83简便计算)

17.5*2.3 - 7.5*2.3的简便计算

17.5*2.3-7.5*2.3=2.3x(17.5-7.5)=2.3x10=23

7.5*2.3 - 0.5*2.5 22.5*0.4简便计算?

7.5*2.3-0.5*2.5+ 22.5*0.4=2.5*(3*2.3)-0.5*2.5+ 2.5*(9*0.4)=2.5*(6.9-0.5+3.6)=2.5*10=25

1.83*7.5+1.83*3.5 - 1.83的简便运算

1.83*7.5+1.83*3.5-1.83=1.83*(7.5+3.5-1)=1.83*10=18.3

3.7*7.5 3.5*3.7 - 3.7这道题怎么做

用乘法交换律和乘法结合律. 1.8*3.7*5=1.8*5*3.7=9*3.7=33.3

7.5*2.3+1.9x22.5x0.4简便运算

7.5*2.3+1.9x22.5x0.4=17.25+1.9*9=17.5+17.1=34.6

7.5*2.3+1.9*2.5 用简便方法

7.5*2.3+1.9*2.5+12.5*0.4=2.5*3*2.3+1.9*2.5+2.5*5*0.4=2.5*(6.9+1.9+2)=2.5*10.8=2.5*(10+0.8)=2.5*10+2.5*0.8=25+2=27

7.5乘以2.3除以7.5乘以2.3用简便方法计算

解:7.5*2.3÷7.5*2.3=7.5÷7.5*2.3*2.3=2.3^2=5.29简单

括号里7.5 - 2.3*0.4括起来除以0.01脱式计算

(7.5-2.3x0.4)÷0.01=(7.5-0.92)÷0.01=6.58÷0.01=658分析:第一步:先算2.3*0.4=0.92第二步:再算7.5-2.3*0.4=7.5-0.92=6.58第三步:算(7.5-2.3*0.4)÷0.01=658

7.5*2.8 5.7*2.3简便方法

7.5*2.8+5.7*2.3=7.5*4*0.7+2.3*6-2.3*0.3=30*0.7+13.8-0.69=21+13.11=34.11

用简便运算计算7.5*2.3+31*2.5

7.5*2.3+1.9*2.5=2.5*3*2.3+1.9*2.5=2.5*6.9+1.9*2.5=2.5*8.8=2.5*4*2.2=10*2.2=22