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15×606604×15 21.5021.5
120×20= 250×4= 150÷30= 199×31≈
5a+3a= a×a= 3.1+0.9= 0.38+0.2=
3.7-2.5= 1-0.52= = 1- =
①125×56
②23×99+23
③15.79+1.86-4.79
④16.68-5.24-4.76
⑤
进入组卷