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7 22 25 40 517

7+22x25-40 =7+550-40 =557-40 =517

25*20+57-40=517 57+25*20-40=517 57-40+25*20=517

285÷57=5; 5 572 8 5 2 8 5 0517÷25=20…17; 2 0 255 1 7 5 0 0 1 7436÷47=9…13; 9 474 3 6 4 2 3 1 3验算: 4 7× 9. 4 2 3 + 1 3 4 3 6920÷40=23; 2 3 409 2 0 8 0 1 2 0 1 2 0 0624÷80=7…64; 7 806 2 4

50*10+57-40

25×(40+7) =25×40×7 =1000×7 =7000

2/7×14/15=4/15 6/7÷3=2/7 12÷6/11=22 3/4÷9/16=4/3 25×40%=10 20×【1/4-1/5]=1 1÷2/5=5/2

50×70=3500, 40×30=1200, 25×40=1000, 160×3=480, 60×40=2400, 200×7=1400, 12×30=360, 22×4=88, 25×20=500, 48×20=960, 300×5=1500, 180×5=900, 18×3=54, 60×6=360, 35×4=140, 72×2=144, 15×30=450, 17×40=680, 190×3=570,...

25÷40=5/8=0.625

X+4分之3X=16分之7 4分之7x=16分之7 x=4分之1 百分之60X+25=40 0.6x=40-25 0.6x=15 x=25 X+百分之10X=22 1.1x=22 x=22÷1.1 x=20 X- 百分之29等于71 0.71x==71 x=71÷0.71 x=100

您好: 1、 3又2分之1÷4﹢360×25%﹢0.25×36.5 =3.5x0.25+360x0.25+36.5x0.25 =(3.5+360+36.5)x0.24 =400x0.25 =100 2、﹙7.25×40%﹢2.75×5分之2﹚÷20% =(7.25x0.4+2.75x0.4)x5 =(7.25+2.75)x0.4x5 =10x2 =20 3、 [1.9+19%×﹙4.8-3又5分之4...

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