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用递等式计算,能简便计算的要用简便计算.①13×105-1890÷18②1.25×(0.8+19.2÷0.24)③716×9-7÷167④514÷[(56-38)×1011].
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▼优质解答
答案和解析
①13×105-1890÷18
=1365-105
=1260
②1.25×( 0.8+19.2÷0.24 )
=1.25×(0.8+80)
=1.25×0.8+1.25×80
=1×100
=100
③
×9-7÷
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6 6 67 7 7
=1365-105
=1260
②1.25×( 0.8+19.2÷0.24 )
=1.25×(0.8+80)
=1.25×0.8+1.25×80
=1×100
=100
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