1.234²+0.766²+2.468×0.766-3.35²+0.75²

1.234²+0.766²+2.468×0.766-3.35²+0.75²
1.234²+0.766²+2.468×0.766-3.35²+0.75²

1.234²+0.766²+2.468×0.766-3.35²+0.75²
1.234²+0.766²+2.468×0.766-3.35²+0.75²
=1.234²+0.766²+2x1.234×0.766-3.35²+0.75²
=(1.234+0.766)^2+0.75²-3.35²
=4+(0.75+3.35)(0.75-3.35)
=4+4x(-2.6)
=-4*1.6
=-6.4
请选为满意答案

原式=（1.234²+2×1.234×0.766+0.766²）+（0.75²-3.35²）
=（1.234+0.766）²+（0.75+3.35）（0.75-3.35）
=4+4.1×（-2.6）
=-6.66