(东山县)怎样简便就怎样计算.(1)3.5×0.8+5.5×80%+,(2)920÷40+23×50.
直接写出得数. 0.44+++0.6 +2×2﹣2÷ (4﹣2)÷(1+2.4) 48200﹣156×720÷39 (3.06÷0.25+2.76)×0.2 [3÷(3﹣2.4×)]×0.2.
0.38×7﹣+4×.
计算:(1)208×145﹣24990÷238(2)10﹣1×3﹣1÷1(3)(2.76÷0.3﹣4)×(0.25+)(4)[3﹣(0.2+)×4.5]÷2(5)(15.4﹣6×)÷(2+)
简算(1)12.96﹣7.31﹣2.69(2)59.6×3+6.625×59(3)12.5×2.5×4×0.8(4)(++)×24.
解方程 5.5﹣x=2; x:0.75=2; 2x+30%x=9.2.