+ = - = - = - =
- = + = - = - =
32a+a= 2.5×0.8= 0.36÷3.6= 9÷0.3=
4.5÷9= 12-4.9= 6.7×100= 3.5×4=
×4=
1-= 32×= -1=
368+59= 1000-357= 608×6= 380×4=
405×0×6= (502-500)×8= 16÷4×3= 160+120×7=
+ = - = + = 1- =
÷ = + = - = 2÷ = 1-70%=
3.14×6= 100÷12.5= 0.16÷0.4= 14÷35= 5×40%=
1.2÷1.5=
-0.25=
0.35×1.6=
9÷17=
正方形个数
2
3
4
……
8
n
直角三角形个数
12
100
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