能简算的用简便方法计算.(54+)÷9 (﹣)÷3.1×99+3.1 ×16.31﹣2.31÷ 36÷[(﹣)×3].
竖式计算37.8+3.02= 8.5﹣6.69= 20﹣15.07=
7.28﹣(0.8+3.28) 3.15+1.83+6.85+2.17 5.3+0.98+2.72.72﹣3.98+5.28﹣2.02 10.78﹣1.54﹣2.46 8.44﹣(5.44+2.8)
口算3.2+0.6= 7.2﹣5.2=6.5+3.4= 4.3元﹣0.3元=15×20= 60×40=50×40= 200÷5=
0.9+0.42=53.9﹣5.9=5.4+4.6×5=0.25×4÷0.25×4=4÷3.3=(商用循环小数表示)
列竖式计算:①13.7+0.84= ②0.91﹣0.284= ③30﹣6.83=