x+3.4x=30.8
(x+1.2)×6=10.8
(x-7)÷5=57.6
0.9×2=
0.7×0.5=
2.4×2=
1.3×0.3=
1.1×3=
2.2×0.1=
7×0.8=
80×0.5=
41.6÷2.6=
2.56÷32=
※6.75÷0.15=
16÷20%= 4.8÷(0.4+1.2)=
-(-)= 12÷0.25÷4=