计算下面各题,怎样简便就怎样算.28+155+172+345 (175﹣96)×36÷12 12.16+31.8﹣9.16493﹣3625÷25+187 330﹣187﹣13+670.
计算 (1)10÷3.14﹣6.86÷3.14(2)+9+99+999.
简算.×3+×5+×10 999×7+111×7(+++)×2002.
简算 ①9﹣(3+0.4) ②1.8×+2.2×25% ③×[0.75﹣(﹣)].
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