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12×5= 25×2= 5.6-4.4= 3.6+0.4= 4-2.3-1.7=
4+12.5= 5-3.6= 5×4+5×4= 1.4-0.8= 7.7-6.6=
12×50= 40×30= 25×40= 84÷7=
306÷3= 124×2= 102×5= 160÷4=
+ = 1- = - = + =
37×5656×37 324÷6816÷8
803千克890克
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