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脱式计算(能简算的要简算)4038%2 720÷18 148H×2 125×32×25 7...

(1)403-198-2,=403-(198+2),=403-200,=203;(2)720÷18=40; (3)148-48*2,=148-96,=52;(4)125*32*25,=125*8*4*25,=(125*8)*(4*25),=1000*100,=100000;(5)76+149+24,=(76+24)+149,=100+149,=249;(6)154-(54+98),=154-54-98,=(154-54)-98,=100-98,=2.

(1) 5 18 ÷[( 7 8 - 2 3 )* 4 5 ]= 5 18 ÷[ 5 24 * 4 5 ]= 5 18 ÷ 1 6 = 5 18 *6= 5 3 (2) 16 7 * 5 8 - 2 7 ÷ 8 5 = 16 7 * 5 8 - 2 7 * 5 8 =( 16 7 - 2 7 )* 5 8 =2* 5 8 = 5 4 (3)1.05*(3-0.9)÷6.3=1.05*2.1÷6.3=1.05*(2.1÷6.3)=1.05* 1 3 =0.35

(3)235+78+165=235+165+78=400+78=478(1)31*8*125=31*(8*125)=31*1000=31000;(4)52*71+29*52=(71+29)*52=100*52=5200;(2)984-87*(360÷60)=984-87*6=984-522=462;(5)25÷[125÷(625÷25)]=25÷[125÷25]=25÷5=5

(1)(125+8)*8,=125*8+8*8,=1000+64,=1064; (2)25*13*4,=25*4*13,=100*13,=1300; (3)18.8-4.125-5.875,=18.8-(4.125+5.875),=18.8-10,=8.8;(4) 3 5 * 11 10 + 2 5 ÷ 10 11 ,= 3 5 * 11 10 + 2 5 * 11 10 ,=( 3 5 + 2 5 )* 11 10 ,= 11 10 ;(5)

(1)25*18*4=25*4*18=100*18=1800;(2)125*12*8 =125*8*12=1000*12=12000;(3)169+78+22=169+(78+22)=169+100=269;(4)45*38+45*62=45*(38+62)=45*100=4500;(5)(277+187)÷58=464÷58=8;(6)360÷(12+6)*5=360÷18*5=20*5=100.

(62616964757a686964616fe4b893e5b19e313333353337621)1020+270÷18-864,=1020+15-864,=171;(2) 2 3 ÷0.8* 3 4 ,= 2 3 ÷ 4 5 * 3 4 ,= 2 3 * 5 4 * 3 4 ,= 5 8 ;(3) 1 8 + 5 7 +6.875+ 2 7 ,=( 1 8 +6.875)+( 5 7 + 2 7 ),=(0.125+6.

(1)0.08*720*1.25=0.08*1.25*720=0.1*720=72;(2)5.25*8.2+5.25*0.8+5.25=5.25*(8.2+0.8+1)=5.25*10=52.5;(3)0.125*808=0.125*(8*101)=(0.125*8)*101=1*101=101;(4)18.45-(3.8*2.7+5.3)=18.45-(10.26+5.3)=18.45-15.56=2.89;(5)0.5+7.2÷1.44*0.4=0.5+5*0.4=0.5+2=2.5;(6)1.32*(0.9÷18)=1.32*0.05=0.066.

①(50-40*1.2)÷0.5=(50-48)÷0.5=2÷0.5=4;②8*4*125*25=(8*125)*(4*25)=1000*100=100000;③18.8- 2 3 -3.8- 1 3 =(18.8-3.8)-( 2 3 + 1 3 )=15-1=14;④32*71.1+28.9*32=32*(71.1+28.9)=32*100=3200.

1. 4*125*8*25 =(4*25)*(125*8) =100*1000 =1000002. 4.8÷2.5÷0.4=4.8/(2.5*0.4) =4.8/1 =4.8 3. 920÷40+23*99 =23+23*99 =23*(1+99) =23*100 =23004. {(8.7-7.5)÷0.2}*0.15 =[1.2/0.2]*0.15 =6*0.15 =0.9

(382X26分之7+0.618X26分之7)X3又7分之5=(382*7/26+0.618*7/26)*26/7=382+0.618=382.6185分之4+25分之3X21分之5+5分之3X2=4/5+3/25*5/21+3/5*2=4/5+1/35+6/5=28/35+1/35+42/35=71/35333X332332332-332X333333333=333X

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