
用简便方法计算527+199 735-198...
用简便方法计算527+199735-198105×99865-19875×9868×99+6863×88+88×3758×99+58...
用简便方法计算527+199 735-198 105×99 865-198 75×98 68×99+68 63×88+88×37 58×99+58
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(1)527+199
=527+(200-1)
=527+200-1
=727-1
=726;
(2)735-198
=735-(200-2)
=735-200+2
=535+2
=537;
(3)105×99
=105×(100-1)
=105×100-105×1
=10500-105
=10395;
(4)865-198
=865-(200-2)
=865-200+2
=665+2
=667;
(5)75×98
=75×(100-2)
=75×100-75×2
=7500-150
=7350;
(6)68×99+68
=68×(99+1)
=68×100
=6800;
(7)63×88+88×37
=(63+37)×88
=100×88
=8800;
(8)58×99+58
=58×(99+1)
=58×100
=5800.
=527+(200-1)
=527+200-1
=727-1
=726;
(2)735-198
=735-(200-2)
=735-200+2
=535+2
=537;
(3)105×99
=105×(100-1)
=105×100-105×1
=10500-105
=10395;
(4)865-198
=865-(200-2)
=865-200+2
=665+2
=667;
(5)75×98
=75×(100-2)
=75×100-75×2
=7500-150
=7350;
(6)68×99+68
=68×(99+1)
=68×100
=6800;
(7)63×88+88×37
=(63+37)×88
=100×88
=8800;
(8)58×99+58
=58×(99+1)
=58×100
=5800.

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