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Worksheets乘法公式
Total questions: 10
Worksheet time: 10mins
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Worksheets1003×997=(1003+997)×(1003−997)
302×298=(a+b)×(a−b)
b=298
a=300
a=302
b=2
(300+2)(300−2)=a2−b2
a=302
b=2
a=300
b=298
9982=(a−b)2
a=998
a=1000
b=2
1972=(200−3)2=2002−32
1992=2002−2×200×1−12
10182−182=1036×1000
2052=2002+2×200×5+5
9082=9002+2×900×8+82
997×1003=(1000−3)×(1000+3)
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