题目应该是:0.39×9.8+2×0.039这样的吧?
= 0.39×9.8+0.2×0.39
=0.39×(9.8+0.2)
=0.39×10
=3.9
= 0.39×9.8+20×0.39
=0.39×(9.8+20)
=0.39×29.8(如果题目不变,后面凑不成10,无法简便运算啊!)
=11.7-0.078
=11.622
1年前
=3.9*9.8+0.2*3.9
=3.9*(9.8+0.2)
=3.9*10
=39
“*”这个符号是乘号。
1年前
= 3.9×0.98 2×3.9
=3.9×(0.98 2)
=3.9×2.98
=11.622
没打出来的是加号
望采纳 , 谢谢!!!
1年前
共回答了262个问题
题出的有问题
1年前
=3.9*9.8*0.1+2*3.9
=3.9*0.98+2*3.9
=3.9*(0.98+2)
=3.9*2.98
=11.622
1年前