x+18-25=43 27x+31x=145 7x-16×4=27
6×0.8+7x=19.5 x-0.8x=10 3.6x÷2=2.16
0.88+0.2= 3.85-1.76= 1÷0.1-1×0.1=
0.8×0.125= 2.5×(4+0.4)= 1÷1.25=
2.5+7.5÷10= 11.96÷12≈ (凑整到百分位)
①24和36
②33和66
③51和68
①+x=
②x-=
③1-x=
4
7
3
2
6
9
1
8
5
13头
19只
6头