①8×1.25=
②678+206=
③+=
④×7.2=
⑤3.2a﹣a=
⑥2.875+
⑦18.23﹣2.3=
⑧3÷=
⑨633÷91≈
⑩59×42≈
4+0.7x=102
x=3600
3.6+0.4=
1÷20%=
10﹣0.95=
5.3b﹣1.3b=
×14=
+=
÷=
×12÷12×=
9.09﹣0.9= 0.8×0.32= 50÷10%= 0.125×32× =
7÷14%= = = 2.5+2.5÷5=
1.5×1= 910÷70= 2.2﹣1.9= 6÷7= 435+199=
+= -= ÷= 20×= ×=
9.9×5.9 60 1
层数
1
2
3
4
5
……
火柴棒根数
10
面积