简便运算．（1）4.2×4.2+4.2×5.8 （2）0.89×99．
直接写出得数．=== 1= 0×==== 20==
直接写出得数：÷=÷3=××=÷2= 6×=×9×= 5÷﹣÷5= 2.7﹣= （1.6+3.2）×0.125=
直接写得数： 12÷=×30=÷= 16×=÷=÷4=÷×1=÷×=÷3=÷6=÷3=÷．
直接写数：==========
直接写得数．×3= 6÷=÷1= 1÷÷=÷= 0.5÷=﹣= 0÷×=
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= 1
= 0×
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= 20
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÷
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÷3=
×
×
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÷2=
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×9×
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﹣
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×30=
÷
= 16×
÷
÷4=
÷
×1=
÷
×
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÷3=
÷6=
÷3=
÷
．
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×3= 6÷
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÷1=
÷
÷
= 0.5÷
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﹣
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