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（p-q）^4÷（q-p）^3 · （p-q）² （-3a）^3-(-a) · （-3a）^2 4-(-2)^-2-3²÷（3.14-π）^0 (-1/3)^-2+(1/9)^0+(-5)^3÷（-5）² （-10）^3×（2×10^-5）^0-(1/10)^-2×10×2 x^m · （x^n）^3÷（x^m-1 · 2x^n-1） (b-a)(b-a)^3(a-b)^5 (a-b) ^ 5m (B-A) ^ 2m ÷ (B-A) ^ 7m (M is even, a ≠ b) [(n-m)²]^p · [(m-n)(m-n)^p]^5
Practical problems in junior high school
A starts from 8 a.m. and walks 4.5 kilometers per hour. B starts from 9:30 a.m. by bike and meets a 5 / 2 hour later. How fast is B going?
4.5*(1.5+2.5)+2.5x=50
x=12.8
A calculation problem
2008 times 98 and a quarter minus 225 times 10 and a quarter plus 200 and a quarter times 28 and a quarter =
2008 × 98 and 1 / 4-225 × 10 and 1 / 25 + 200 and 4 / 5 × 28 and 3 / 4
=2008×98+2008×1/4-225×10-225×1/25+（200+4/5）×（28+3/4）
=2008×（100-2）+502-2250-9+200×28+200×3/4+4/5×28+4/5×3/4
=200800-4016+502-2259+5600+150+22.4+0.6
=200800-4016-2259+502+5600+150+23
=200800-6275+6275
=200800
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