一袋面粉25千克，每千克2元，每袋面粉多少钱？（先写出数量关系式再解答）
直接写得数：+= 1﹣= 1÷=﹣=×= 0÷= 0.9+99×0.9=（+）×12=
直接写出得数． （1）1﹣= 1÷=﹣=×= 0÷= （2）28×0.1= 1.3×3= 2.1×0.4= 5.4÷0.9= 10﹣9.99=
直接写出得数．+=﹣=÷= 1÷=×=××= 8×+8×= 55×÷=×÷×= 0×+=
直接写得数 5﹣=×16= 1÷=÷=×=+=﹣= 6﹣=×6=（+）×8=
直接写得数+=﹣=×=×5= 2﹣= 3÷7=÷=÷4=
+
= 1﹣
= 1÷
=
﹣
=
×
= 0÷
= 0.9+99×0.9=（
+
）×12=
=
=
﹣
=
×
+
=
﹣
=
÷
= 1÷
=
×
=
×
×
=
+8×
= 55×
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×
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= 0×
+
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=
×16= 1÷
=
÷
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×
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+
=
﹣
= 6﹣
=
×6=（
+
+
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﹣
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×
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×5=
= 3÷7=
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÷4=
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