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列竖式计算(带☆要验算)52×60=321÷3=600÷5=☆47×32...

52×60=3120321÷3=107600÷5=120☆47×32=1504验算:☆840÷8=105验算:☆48×54=2592验算:

8.32 +15.52 ———— 23.84

竖式解答

9405-2940÷28×21 920-1680÷40÷7 690+47×52-398 148+3328÷64-75 360×24÷32+730 2100-94+48×54 51+(2304-2042)×23 4215+(4361-716)÷81 (247+18)×27÷25 36-720÷(360÷18) 1080÷(63-54)×80 (528+912)×5-6178 8528÷41×38-904 264+318-8280...

408-12×24 (46+28)×60 42×50-1715÷5 32+105÷5 (108+47)×52 420×(327-238) (4121+2389)÷7 671×15-974 469×12+1492 405×(3213-3189) 5000-56×23 125×(97-81) 6942+480÷3 304×32-154 20+80÷4-20= 100÷(32-30)×0= 25×4-12×5= 70×〔...

按照小明的计算,52-32 = 20, 20÷4 = 5,所以括号数字是4 32÷4 = 8, 52-8 = 44, 正确的书应该是44

52-32+25=20+25=45 ()+42-24=()+18 所以 45-18=27 52-32+25=(27)+42-24

9405-2940÷28×21 920-1680÷40÷7 690+47×52-398 97-12×6+43 26×4-125÷5 148+3328÷64-75 360×24÷32+730 2100-94+48×54 51+(2304-2042)×23 4215+(4361-716)÷81 (247+18)×27÷25 36-720÷(360÷18) 1080÷(63-54)×80 (528+912)×5-6178 8528÷41×38-904 26...

(1)∵32-12=4×2,42-22=4×3,52-32=4×4,∴(n+2)2-n2=4(n+1);(2)(n+2)2-n2=(n+2+n)(n+2-n)=(2n+2)×2=4(n+1).

32.52-(6+9.728÷3.2)×2.5 5. x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2 =[x(y+z)-y(x-z)]^2 =(xz+yz)^2 =z^2(x+y)^2 6. 3(a+2)^2+28(a+2)-20 =[3(a+2)-2][(a+2)+10] =(3a+4)(a+12) 7. (a+b)^2-(b-c)^2+a^2-c^2 =(a+b)^2-c^2+a^2-(b-c)^2 =(a+b+c)(...

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