4(x+3.9)=25.2
0.8x-7.8=1.4
3.2÷0.8+0.3x=25
4.21×101-4.21
0.125×2.5×8.8
0.47÷0.25÷0.4
2.4×(6.4+3.6÷0.5)
1÷0.25= 0.39÷3= 4.6×5÷4.6×2=
1.25×0.8= 0.46+0.4= 12.8+7.5-12.8+7.5=
用0,1,2,3,4,5,6,7,8这九个数字组数。
1.2×0.3= ﹣= 32÷53×0=
0.25÷= 1﹣0.09= +20%=