用乘法公式计算 ①535^2x4-465^2x4 ②202^2+202x196+98^2

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用乘法公式计算 ①535^2x4-465^2x4 ②202^2+202x196+98^2

用乘法公式计算 ①535^2x4-465^2x4 ②202^2+202x196+98^2
用乘法公式计算 ①535^2x4-465^2x4 ②202^2+202x196+98^2

用乘法公式计算 ①535^2x4-465^2x4 ②202^2+202x196+98^2
①535^2x4-465^2x4
=4×(535²-465²)
=4×(535+465)(535-465)
=4×1000×70
=280000
②202^2+202x196+98^2
=202²+2×202×98+98²
=(202+98)²
=300²
=90000

①535^2x4-465^2x4 = 4x(535^2-465^2)=4x(535+465)x(535-465)
=4x1000x70=280000
②202^2+202x196+98^2
=202^2+2x202x98+98^2
=(202+98)^2=300^2=90000

535^2x4-465^2x4=4*(535^2-465^)=4*(535+465)*(535-465)=4000*70=280000
202^2+202x196+98^2=202^2+2*202*98+98^2 =(202+98)^2=90000

535²x4-465²x4
=(535²-465²)×4
=(535+465)(535-465)×4
=1000×70×4
=70000x4
=280000
202²+202×196+98²
=202²+2×202×98+98²
=(202+98)²
=300²
=90000

1,原式=(535-465)(535+465)*4=70*1000*4=280000
2,原式=(202+98)^2=90000