在□里填上合适的数,在○里填上运算符号.(25+14)×4=□○□○□○□=□○□=□;37×16+16×53=(□+□)○□=□○□=□;48×2+52×2=(□○□)○□=□○□=□;125×(8+9)=□○□○□○□=□○□=□;a×b+c×b=(□○□)○□.
(25+14)×4 =25×4+14×4 =100+56 =156; 37×16+16×53 =(37+53)×16 =90×16 =1440; 48×2+52×2 =(48+52)×2 =100×2 =200; 125×(8+9) =125×8+125×9 =1000+1125 =2125; a×b+c×b =(a+c)×b. |