0.45× 198 简便计算(1.3+1.3+1.3+1.3)×2.5 一定要快
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0.45×198简便计算(1.3+1.3+1.3+1.3)×2.5一定要快0.45×198简便计算(1.3+1.3+1.3+1.3)×2.5一定要快0.45×198简便计算(1.3+1.3+1.3+1
0.45× 198 简便计算(1.3+1.3+1.3+1.3)×2.5 一定要快
0.45× 198 简便计算
(1.3+1.3+1.3+1.3)×2.5
一定要快
0.45× 198 简便计算(1.3+1.3+1.3+1.3)×2.5 一定要快
0.45× 198
=0.45x(200-2)
=0.45x200-0.45x2
=90-0.9
=89.1
(1.3+1.3+1.3+1.3)×2.5
=1.3x4x2.5
=1.3x10
=13
0.45*200-0.45*2=89.1
1.3*4*2.5=13
(1.3+1.3+1.3+1.3)×2.5
=1.3*4*2.5
=1.3*10
=13
0.45× 198
=0.45*(200-2)
=0.45*200-0.45*2
=90-0.9
=89.1
=0.45*(200-2)
=90-0.9
=89.1
第二个
=4*2.5*1.3
=13
额 晕 。
0.45*(200-2)
0.45*200-0.45*2 就行啦