4.3+5.8=________3.6+6.4=________0.74-0.34=________0.9-0.25=________5×4=________0.21×3=________0.64÷0.8=________0.48÷0.12=________88÷8=________1.1×9=________1÷0.25=________0÷0.4=________15÷0.3×0.1=________0.4÷0.2=________（0.7+0.8）×3=________7×1.2+0.8=________1.8×4-1.2=________（2.6-1.8）×0.5=________4+3.2÷0.8=________0.72÷72-0.1=________7.5÷2.5-0=________．
网友回答
10.1 10 0.4 0.65 20 0.63 0.8 4 11 9.9 4 0 5 2 4.5 9.2 6 0.4 8 -0.09 3
解析分析：本题按照运算法则直接计算，小数加减法注意小数点对齐，小数乘法看因数中一共的小数位数，小数除法把除数变成整数，被除数扩大相同的倍数．
解答：4.3+5.8=10.13.6+6.4=100.74-0.34=0.40.9-0.25=0.655×4=200.21×3=0.630.64÷0.8=0.80.48÷0.12=488÷8=111.1×9=9.91÷0.25=40÷0.4=015÷0.3×0.1=50.4÷0.2=2（0.7+0.8）×3=4.57×1.2+0.8=9.21.8×4-1.2=6（2.6-1.8）×0.5=0.44+3.2÷0.8=80.72÷72-0.1=-0.097.5÷2.5-0=3．
点评：本题是基本的计算题目，计算时要细心，注意运算符号和数的特点．