1.78x9.9 +17.8简算怎么答
1.78x9.9 +17.8 =17.8×0.99+17.8 =17.8×(0.99+1)=17.8×(2-0.01)=35.6-0.178 =35.422
200分!!!{小学数学题(出题)}
0.9+0.1= 1-0.8= 51÷3= 360÷4= 36+44= 3800-900= 4×12= 80-19= 7×13= 4.5-4= 5.6+4= 5.7+3.3= 10-4.4= 6+6.6= 9.5-2.7= 1-0.55= 3.7+4.8= 7+3.3= 0.9+1= 45÷3= 2....