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简便计算9999+999+99+94821-9983.2*12.5*251.25*883.6*0.25
题目详情
简便计算
9999+999+99+9
4821-998
3.2*12.5*25
1.25*88
3.6*0.25
9999+999+99+9
4821-998
3.2*12.5*25
1.25*88
3.6*0.25
▼优质解答
答案和解析
9999+999+99+9
=(10000-1)+(1000-1)+(100-1)+(10-1)
=10000+1000+100+10-1-1-1-1
=11110-4
=11106
4821-998
=4821-(1000-2)
=4821-1000+2
=3821+2
=3823
3.2*12.5*25
=(8*0.4)*12.5*25
=(8*12.5)*(0.4*25)
=100*10
=1000
1.25*88
=1.25x(80+8)
=1.25x80+1.25x8
=100+10
=110
3.6*0.25
=0.9*4*0.25
=0.9*(4*0.25)
=0.9*1
=0.9
=(10000-1)+(1000-1)+(100-1)+(10-1)
=10000+1000+100+10-1-1-1-1
=11110-4
=11106
4821-998
=4821-(1000-2)
=4821-1000+2
=3821+2
=3823
3.2*12.5*25
=(8*0.4)*12.5*25
=(8*12.5)*(0.4*25)
=100*10
=1000
1.25*88
=1.25x(80+8)
=1.25x80+1.25x8
=100+10
=110
3.6*0.25
=0.9*4*0.25
=0.9*(4*0.25)
=0.9*1
=0.9
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