文档介绍：++++++=_________。+234+345-456+567+678+789-890=_________。-1+2-3+4-5+...+1948-1949=_________。+87+88+79+100+62+75+95+85+69+72+98+89+77+54+75+92+85+83+76+65+60+79+86+100+49+97+97+80+78=_________。++++++++++++++=_____。6.=_________。+{3+[4+(5+6)×7]×8}×9=_________。8.=_______。×=_________。××32=_________。÷=_________。×××…×=_________。×+×+×=_________。×3367+3456×3456-4825×4825=_________。15.=_________。16.=_________。17.=_________。18.=_________。19.=_________。20.=_________。21.=_________。22.=_________。23.=_________。24.=_________。25.=_________。+2341+3412+4123=______。+103+107+109+113+127+131+137+139+149+151=______。+384+147-328-167-529=______。++++=______。+--=______。+1993-1992+1991+1990+1989-1988-1987+……+10+9-8-7+6+5-4-3+2+1=______。7.=______。8.=______。×=______。÷×=______。×3×5×7×11×13=______。12.(11×10×9……×3×2×1)÷(22×24×25×27)=______。×+×=______。×+×28=______。15.=______。16.=______。17.=______。18.(111×58-148×16)÷37=______。19.=______。20.=______。××36-125××=______。×10001+66666×6666=______。23.=____。24.=______。25.=______。+3×3-3÷3=_______。++++++++=_______。++-=_______。×÷=_______。5.+++++++=____。6.(2×3×5×7×11×13×17×19)÷(38×51×65×77)=__________。7.=___________。8.(-)÷×3-(+)÷7=___________。×125+4268×25+8426×5=___________。10.=___________。11.=___________。12.×=___________。13.=___________。14.=___________。15.=______。16.=___________。17.=___________。×+674×=___________。19.=___________。20.=___________。21.=___________。22.=___________。-[-([]×)]+×÷=,[]=__