妈妈要做一个长60cm，宽50cm，高45cm的电视机罩，若要给这个电视机罩的正面一周镶上花边，需要多长的花边？
直接写得数． 10÷=÷=×= 55×÷=×2= 1÷=÷= 0×+=
口算×15=×2=×=×=÷=÷3=÷5=÷=
直接写得数 24×= 72×= 12÷=÷3= 0÷= 3÷=×=﹣×0=
画一画． （1）= （2）÷4=
直接写出得数．×= 1÷=÷60%=×15=﹣= 4.5+=×= 6.8÷10%=
=
÷
=
= 55×
÷
=
×2= 1÷
=
÷
= 0×
+
=
×15=
×2=
×
=
×
=
÷
=
÷3=
÷5=
÷
=
= 72×
= 12÷
=
÷3=
= 3÷
=
×
=
×0=
=
÷4=
×
= 1÷
=
÷60%=
﹣
×
= 6.8÷10%=
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