数学两道题――求简算
1.48×101-48 2.31×167-31×67 简算!简算!简算!
解:
1.
48×101-48
=48×(101-1)
=48x100
=4800
2.
31×167-31×67
=31×(167-67)
=31x100
=3100
O(∩_∩)O~
1.48x101-48
=1x101+0.48x101-0.48x100
=101+0.48
=101.48
2.31x167-31x67
=2.31x100+2.31x67-31x67
=231+2x67+0.31x67-31x67
=231+134-67x30.69
=365-...
后面就是计算了
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