问题
计算题
计算:
(1)a2-(b2-3ab)-[(a2+b2)+3ab];
(2)3(x2y+xy)-2(x2y-xy)-5x2y;
(3)214×0.516;
(4)x3·x5·x7+x·x6·x8;
(5)(-2x4)4+2x(-2x2)3+2x4·5(x4)3。
答案
解:(1)原式=a2-b2+3ab-a2-b2-3ab=-2b2;
(2)原式=3x2y+3xy-2x2y+2xy-5x2y=-4x2y+5xy;
(3)原式=214×0.514×0.52= (2×0.5)14×0.52=0.25;
(4)原式=x3+5+7+x1+6+8=x15+x15=2x15;
(5)原式=(2x4)4-2x10(2x2)3+2x4·5x4×3
=24·x4×4-2x10·23·x2×3+2x4·5·x4×3
=16x16-16x16+10x16=10x16。