连一连.
计算,能用简便计算就用简便计算.(1)4.2﹣1.38+5.8﹣3.62(2)(3)(4)0.125×0.25×32(5)(6)99.8×98+99.8×102.
用简便方法计算9﹣(+) 1.8×+2.2×25% 6.9×99+6.9 67×1012.5×32×0.125 ﹣+﹣ 10000÷125÷8 105×(++)
40×7×3×5.
灵活计算(能简算的要写出简算过程)①1.75﹣﹣②③(++)×12④15×(+)÷.
﹣2.25﹣.