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58x98筒便计算

58X98=58x(100-2)=58x100-58x2=5800-116=5684

58X100-58X2=5684

58*100-58*2

=56x(100-98) =56x100-56x2 =5600-112 =5488

58*98=58*(100-2)=58*100- 58*2=5800- 116=5684

原式=59x98+59x2=59x(98+2)=59x100=5900 供参考.

57+66x98+75=132+66x98=2x66+66x98=(2+98)x66=100x66=6600

55x98=(50+5)x98=50x98+5x98=4900+490=5390

原式=0.58x98+0.58x100x0.02=0.58x98+0.58x2=0.58x(98+2)=0.58x100=58或者=0.58x100x0.98+58x0.02=58x0.98+58x0.02=58x(0.98+0.02)=58x1=58供参考.

12x25=(3x4)x25= 3x(4x25)=3x100=300

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