(海州区)脱式计算(能简算的要写出简算过程.)(1)﹣++0.4(2)16÷8(3)(6.9﹣3.15)÷0.3×0.8(4)2.5×(1.9+1.9+1.9+1.9)
(3.75+4.1+2.35)×9.8 1.28+9.8+7.72+10.2
2.5×4.4 25×1.25×32
3.35×6.4×2+6.7×3.6 18.7-3.375-6.625
125×(8+0.8+0.08) 45÷〔78-(25+38)
1.3-3.79+9.7-6.21 8×0.4×12.5×2.5