175－75÷25 =175-3 =172 （114＋166）÷35 68＋35×13 =68+455 =523 432÷（9×8） 725－（125＋237）=725-362=363189－60＋40 =280÷35 =8 216＋305÷5 =216+61 =277
102×99 =102×(100-1) =102×100-102
=10200-102 =10098
382×101-382 =382×(101-1) =382×100 =38200
0.175÷0.25×4 =0.7×4 =2.8 =432÷72 =6 47＋236＋64 =47+(236+64) =47+300 =347
8+2×125 =8+250 =258
4×60×50×8 =(4×50) ×(60×8) =200×480 =96000
0.175÷0.25÷0.4 =0.175÷(0.25×0.4) =0.175÷0.1 =1.75
1
=129+40 =1695+25×44=5+25×(40+4)=5+25×40+25×4=5+1000+100=1105
645-180-245=645-245-180=400-180=220
35×8+35×6-4×35=35×(8+6-4)=35×10=350
200÷［（172－72）÷25］=200÷[100÷25]=200÷4=50
630×［840÷（240－212）］ =630×[840÷28] 800÷25 =800÷100×4 2000÷125 =2000÷1000×8=630×30 =18900 25×63×4 =(25×4) ×63 =100×63 =6300 794－198 =794-200+2 =594+2 =596
97×360＋3×360 =360×(97+3) =360×100 =36000 2800÷ 100＋789 =28+789 =817
240×78÷（154-115） =240×78÷39 =240×(78÷39) =240÷2
=8×4 =2×8=32
=169000÷125 99×11 =9000÷1000×8 =(100-1) ×11=9×8 =1100-11=72 =1089
68×25 72×125 =17×4×25 =9×8×125=17×(4×25) =9×(8×125)=17×100 =9×1000 =1700
=9000
124×25－25×24 =25×(124-24)=25×100=2500
75÷〔138÷（100-54）〕 85×(95－1440÷24) =75÷[138÷46] =85×(95-60)=75÷3 =85×35=25
=2975
80400－(4300＋870÷15) 1437×27＋27×563 =80400-(4300+58) =27×(1437+563)=80400-4358 =27×2000=76042
=54000
2
=480
[75-（12+18）]÷15 =[75-30] ÷15 =45÷15 =3
0.12× 4.8÷0.12×4.8 (6.8-6.8×0.55)÷8.5 =(6.8-3.74) ÷8.5 =3.06÷8.5 =0.36
95÷（64-45） 6.5×（4.8-1.2×4）7.2÷0.8-1.2×5=9-6=3
=(0.12÷0.12) ×4.8×4.8 =95÷19 =1×4.8×4.8 =5
=23.04
25×32×125 7300÷25÷4 8100÷4÷75 =(25×4) ×(125×8) =7300÷(25×4) =100×1000
=7300÷100
=100000 =73
32×(25+125) 78×101－78 =4×8×25+4×8×125 =78×(101-1) =800+4000 =78×100 =4800
=7800
98×199 75×99+2×75 83×102=98×(200-1) =75×(99+2) =19600-98 =75×101 =19502 =75×(100+1) =7500+75
=7575
3
=6.5×(4.8-4.8)=6.5×0 =0
=8100÷(4×75)=8100÷300=27
84×36+64×84 =84×(36+64)=84×100=8400
－83×2 =83×(102-2)=83×100=8300
1
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