Question

简算，要过程！

8.6*2/3+8.6/3 （8.6*三分二）
2.74/5/14+7.26*2.8 (2.74/十四分之五）
9999*7778+3333*6666
5.6*69.32+138.64*0.05+693.2*0.43

Answer 1

1.=8.6*2/3+8.6*1/3
=8.6*（2/3+1/3)
=8.6*1=8.6
2.=2.74*二又五分之四+7.26*二又五分之四
=二又五分之四*（2.74+7.26）
=二又五分之四*10
=28
3.=9999*7778+(3333*3)*(6666/3)
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
4.=5.6*69.32+6.932+69.32*4.3
=5.6*69.32+69.32*0.1+69.32*4.3
=69.32*(5.6+0.1+4.3)
=69.32*10
=693.2

Answer 2

1. =8.6*（2+1）/3=8.6*3/3=8.6
2. =2.74*（14/5）+7.26*2.8=2.74*2.8+7.26*2.8=（2.74+7.26）*2.8=10*2.8=28
3. =9*1111*7778+9*1111*2222=9*1111*（7778+2222）=9999*10000=99990000
4. =5.6*69.32+69.36*0.1+69.32*4.3=（5.6+0.1+4.3）*69.32=10*69.32=693.2