Question

简便方法计算

999.9+99.9+9.9+0.9 497-97×3+37
6.92+11分之8+11分之3+3.18 （9分之1+6分之5+18分之7）×36
9分之4×【0.75+（16分之7+0.25）】 1.32×8分之5+2.68÷1.6

Answer 1

999.9+99.9+9.9+0.9 =(1000-0.1)+(100-0.1)+(10-0.1)+(1-0.1)=1111-4*0.1=1110.6
497-97×3+37 =497-(100-3)×3+37=497-300+9+37=197+46=243
6.92+11分之8+11分之3+3.18
=6.92+（11分之8+11分之3）+3.18
=6.92+1+3.18
=6.92+3.18 +1
=10.1+1
=11.1
（9分之1+6分之5+18分之7）×36
=6/9×36+1/6×36+7/18×36
=24+6+14
=44
9分之4×【0.75+（16分之7+0.25）】
=9分之4×【0.75+16分之7+0.25】
=9分之4×(1+7/16)
=4/9×23/16
=23/36
1.32×8分之5+2.68÷1.6
= 1.32×8分之5+2.68÷（8/5)
=1.32×8分之5+2.68×（5/8)
=（1.32+2.68）×（5/8)
=4×（5/8)
=5/2

Answer 2

999.9+99.9+9.9+0.9=（1000-0.1）+（100-0.1）+（10-0.1）+（1-0.1）=1111-0.3=1110.7
497-97x3+37=500-3-(100-3)x3+40-3=500-3-300+9+40-3=200+40+3=243
6.92+8/11+3/11+3.18=(6.92+3.18)+(8/11+3/11)=10+1=11
(1/9+5/6+7/18)x36=1/9x36+5/6x36+7/18x36=4+30+14=48
4/9x[0.75+(7/16+0.25)]=4/9x..............
太无聊了，作业要自己做