小明家从前平均每月交电费137元，安装太阳能热水器后，今年下半年6个月共交电费576元，平均每月节约电费多少元？
×16=×=﹣=×= 6÷=÷=÷4=÷=+=﹣= 100×= 8×= 1÷=﹣= 12÷= 0×=
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
直接写出得数．÷= 0×=÷=÷1=÷= 1+=×=×=
直接写出得数． 12×=+=÷8=﹣=
×16=
×
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﹣
=
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÷4=
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﹣
= 100×
= 8×
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﹣
= 12÷
= 0×
=
×0=
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×12=
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= 1÷
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×12=
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=（ 
）2= 4﹣4×
= 1
×
= 43÷
=
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=
×8+
×8= 0.9×
= 12×
﹣
×7÷
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÷1=
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= 1+
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×
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÷8=
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