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401乘25的简便运算.

400×25+25

怎么简式算

=401×25-1×25 =(401-1)×25 =400×25 =10000 =(401-1)25 =400×25 =10000

0.25x401 =0.25x(400+1) =0.25x400+0.25x1 =100+0.25 =100.25

解: [401+ (227 +153)]÷25 =[401+380]÷25 =781÷25 =31又6/25

(1)4620+(401-438÷73),=4620+(401-6),=4620+395,=5015;(2)168-52-48,=168-(52+48),=168-100,=68;(3)1300÷25÷4,=1300÷(25×4),=1300÷100,=13;(4)37+125+63+175,=(37+63)+(125+175),=100+300,=400;(5)28×37...

4620+(401-438÷73)=4260+(401-6),=4260+395,=4655;520×(80-720÷9)=520×(80-80),=520×0,=0;350-(350-350÷70),=350-(350-50),=350-300,=50;5580-(120×25-2991),=5580-(3000-2991),=5580-9,=5571;(300-1456÷26)×3...

(8+40)x125 =8x125 +40x125 =1000+5000 =6000 201x83 =(200+1)x83 =200x83 +1x83 =16600+83 =16683 25x(8+20) =25x8+25x20 =200+500 =700 401x13 =(400+1)x13 =400x13+1x13 =5200+13 =5213

(1)17×( 3 17 + 7 18 )×18-40,=17× 3 17 ×18+ 17× 7 18 ×18-40 ,=54+119-40,=173-40,=133;(2)1.25×3.2×0.25,=(1.25×0.8)×(4×0.25),=1×1,=1;(3)7 7 8 -(3.875-2.64),=7.875-3.875+2.64,=4+2.64,=6.64;

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