题目内容
85
×
+71
×
+56
×
.
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分析:85
=80+5
,71
=70+1
,56
=55+1
,然后再根据乘法分配律进行简算.
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解答:解:
85
×
+71
×
+56
×
,
=(80+5
)×
+(70+1
)×
+(55+1
)×
,
=80×
+5
×
+70×
+1
×
+55×
+1
×
,
=30+2+60+1+44+1,
=(30+60+44)+(2+1+1),
=134+4,
=138.
85
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=(80+5
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=80×
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=30+2+60+1+44+1,
=(30+60+44)+(2+1+1),
=134+4,
=138.
点评:此题主要考查了乘法分配律的灵活运用,注意根据实际情况把一个因数看作两个数的和或差来简算.
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