问题标题:
整式的计算:①1.03×0.97;②(x+y)(x-y)(x2+y2);③(2x-3y)(3y+2x)-(4y-3x)(3x+4y).
问题描述:
整式的计算:
①1.03×0.97;
②(x+y)(x-y)(x2+y2);
③(2x-3y)(3y+2x)-(4y-3x)(3x+4y).
任楠回答:
①原式=(1+0.03)×(1-0.03)
=1-0.032
=1-0.0009
=0.9991,
②原式=(x2-y2)(x2+y2)
=x4-y4;
②原式=(2x)2-(3y)2+(3x)2-(4y)2
=4x2-9y2+9x2-16y2
=13x2-25y2.
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