13.7-3.6-4.3-2.1
0.59×101
2.5×12.5×40×0.8
()×24
24×+75÷5+
9×3.45+11.1×180%+54.3÷
0.25×40= 1- 80%= 0.39×20%= 0.75÷=
3-= -= 0÷= 0.21÷0.7=
24.3-5.5=
5-3.76=
3.4×40%=
18.5÷6=
×3.3=
5.63-4.47 +2.37 -0.53
0.125×32×2.5
15÷[12×()]
4×0.6+0.6÷
0.25×1.25×320
2.3×2.75+6.7×2.75+2.75
①5.27-1.57-3.43+4.73
②÷7+×
③12÷[5.6×(-)]
拼成的长方形的周长是厘米,面积是平方厘米;
拼成的正方形的周长是厘米,面积是平方厘米。