（1）一支圆珠笔比一支钢笔便宜多少元？（2）买3支圆珠笔和5支钢笔一共要花多少元钱？
直接写出得数． 40×0.25= 1.25×0.8= 0.1÷0.01=0.6+1.9= 3.5﹣2.25= 12.8÷4=+=﹣= 12×= 1÷=×=÷=
直接写出得数 1﹣0.375= 0.125×8= 280﹣45= 1.3÷0.25= 400÷600= 8.64×100=+=﹣=×=÷= 12×= 6÷=
直接写出得数 0.5×400= 568﹣198=÷= 1÷﹣÷1=×12= 1.7+3.03= 13.5﹣5= 10﹣﹣=
24×0.5=+= 6﹣6÷6= 20×20%= 0.33= 7.2÷0.08= 4÷= 12.5×6.4=﹣= 121×=
直接写出得数 6÷= 19÷=﹣=×= 0.37+1.6= 4.8÷0.8= 1+8%= 2.5÷1.25= 0÷=﹣=
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=+=﹣== 1÷=×=÷=
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= 12×
= 6÷
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×12= 1.7+3.03=
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= 6﹣6÷6= 20×20%=
= 12.5×6.4=
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= 121×
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= 19÷
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×
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