12.6-1.9+1.9+3.39=?
12.6-1.9 1.9-3.39简便方法怎么算?
脱式计算,能简算的要简算.12.6-1.9+1.9-3.39 =
5.78÷1.9=列竖式
1999+199.9+19.9+1.9=
解方程.(X+1.9)/3=7.8
1.9x²—256=0
41.2×8.1+11×1.25+53.7×1.9=
计算:5.7-(-1.9)-0.6=
1.9+19.9+199.9+1999.9+19999.9=?
1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?
12.1+(11分之7+1.9)=
12.6乘7.6乘2.32除以(1.9乘1.4乘2.9) 等于几?简算