用简便方法计算.15﹣0.3= 6﹣0.5= 3.9+12.1= 2.13+14= 0.91+1.25=10﹣0.76= 3.99﹣0.9= 0.567+4.44= 0.37+0.6= 7.46+2.54=1﹣0.08= 45.9+1= 6.87﹣3.25= 0.25+0.75= 0.78+0.22=6.1﹣5.7=
根据乘法口诀算出得数。4×6= 5×6= 4×5= 9÷3=
根据乘法口诀算出得数。4×3= 16÷4= 18÷3= 12÷4=
5×9=45÷5=45÷9=4×9=36÷4=36÷9=
5×7=35÷5=35÷7=2×8=16÷2=16÷8=
5×8=40÷8=40÷5=7×3=21÷7=21÷3=