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四年级脱式100道下册

1、56+31+24=(56+24)+31=80+31=1112、615+475+125=615+(475+125)=615+600=12153、125*64=125*8*8=1000*8=80004、 89+101+111=101+(89+111)=101+200=3015、24+127+476+573=(24+476)+(127+573)=500+700=12006、400-

(1)98+998+9998+99998=(100-2)+(1000-2)+(10000-2)+(10000-2)=100+1000+10000+10000-2-2-2-2=111100-8=111092(2)1127*1123=(1120+7)*(1120+3)=1120*1120+

1.4+4+102.(45+61)-283.65+789-4524.731+854+9435.931+757-7926.493-372+5277.743+948-6568.7987+371-22359.861-656+329810.8975+7865-1120411.8567+872-676912.6981+6787-435413.7657-3541+332114.9654+364-336515.9658

45+240÷12 124+78+22 100-35-25 (140-70)*54 63+84*2÷42 490÷7+24*526*6-110 345+99 (46-20)*30-9025*27*4 15*7+85*7 (40-4)*25125*64 2400÷80-14*2 108-(83+360÷60) (420+48)÷(375-345) 290-(34*3+99) 142-54÷9+14 240÷16 75*4*

25*125*40*8 =(125*8)*(25*40)=1000*1000=1000000 125*18-10=125*8=1000

(1) 103÷73-159-57= (2) 83*91÷131+38= (3) 197-46+67-13= (4) 38÷54*126-52= (5) 192+52*136÷66= (6) 123-47+159-16= (7) 164*23-126+74= (8) 117+21+17-19= (9) 7÷9*161+93= (10) 93*35-128+36= (11) 86*9*187*99= (12) 68÷83-14÷54= (13

1.3/7 * 49/9 - 4/3 2.8/9 * 15/36 + 1/27 3.12* 5/6 2/9 *3 4.8* 5/4 + 1/4 5.6÷ 3/8 3/8 ÷6 6.4/7 * 5/9 + 3/7 * 5/9 7.5/2 -( 3/2 + 4/5 ) 8.7/8 + ( 1/8 + 1/9 ) 9.9 * 5/6 + 5/6 10.3/4 * 8/9 - 1/3 11.7 * 5/49 + 3/14 12.6 *( 1/2 + 2/3 ) 13.8 * 4/5 + 8 * 11/5 14.31 *

4600解析:99*46+46=99*46+1*46=(99+1)*46=100*46=4600

120+90= 543-306= 300÷12= 120*5= 12+18+14= 62+160+38= 14*60= 203-80= 50*15*4= 175-56= 250*8= 420*20= 25+67+75= 4500÷300= 25*38= 54+97= 560÷40= 145+55= 46+49+51= 9100÷70= 103*3= 28*99= 436+208= 323-197= 630÷45

4/9*3= 5÷1/3 = 1/2÷1/3 = 2/7*3/9 ÷2/7 = 21/25÷42= 4/5*3/4 = 8.7*0.2= 4*0.25= 1/7*14= 2/3÷5/6= 1.25*8= 3/5÷5/8= 6/7*3/2= 6*8.8= 4/11÷4= 4/9*3/8= 5/3÷5= 0÷8/3= 4/7 -2/3= 2/7*2 = 41/12*4= 4÷3/16= 12÷9/4 = 75/8 ÷5= 12*16/9 = 2/3*3= 8÷9/4

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