108又5分之2*7.5-84÷15分之2 342*11又4分之1+65.8*112.5 简便计算
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108又5分之2*7.5-84÷15分之2
=108.4x7.5-84x7.5
=(108.4-84)x7.5
=24.4x7.5
=20x7.5+4x7.5+0.4x7.5
=150+30+3
=183
342*11又4分之1+65.8*112.5
=342x11.25+65.8x10x11.25
=11.25x(342+658)
=11.25x1000
=11250
=108.4x7.5-84x7.5
=(108.4-84)x7.5
=24.4x7.5
=20x7.5+4x7.5+0.4x7.5
=150+30+3
=183
342*11又4分之1+65.8*112.5
=342x11.25+65.8x10x11.25
=11.25x(342+658)
=11.25x1000
=11250
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