列式计算.(前两题验算)(1)516﹣236= (2)305﹣267= (3)765+178=(4)47÷5= (5)807×6= (6)450×8=
计算:①3×(x+9)=27②16×8﹣7x=23③7.5﹣7.5×0.5﹣2.6×0.8④13.7×6.5+5.9×13.7﹣12.4×3.7⑤50×[(0.2+4.8﹣4.8+0.2)÷2]⑥11.25+21.25+31.25+41.25+51.25+61.25+71.25+81.25.
计算下列各题①×+25%×+0.25× ②[1﹣(+)]÷③9.6﹣11÷7+×4 ④.
计算(能简算要简算)(1) (2)(3) (4).
直接写出得数.2.5×8= 9÷= ×3÷×3= 12×(﹣)=
(78.6﹣0.786×25十75%×21.4)÷15×1997 8888008×1252001×3.14+200.1×31.4+20.01×314 0.525÷13.125÷4×85.2.