用简便方法计算.1.7+3.98+1504750×515.73-3817+(4.27-2917)45×2.08+1.5×37.699999×77778+33333×66666;362+548×361362×548-18611×4+14×7+17×10+…+197×10012+14+18+11-数学
题文
用简便方法计算.
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答案
1.7+3.98+
=1.7+(3.98+0.02), =1.7+4, =5.7;
=
=
=47+
=47
5.73-3
=5.73+4.27-(3
=10-6, =4; 45×2.08+1.5×37.6, =1.5×62.4+1.5×37.6, =1.5×(62.4+37.6), =1.5×100, =150; 99999×77778+33333×66666, =99999×77778+33333×(3×22222), =99999×77778+(33333×3)×22222, =99999×77778+99999×22222, =99999×(77778+22222), =99999×100000, =9999900000;
=(362+548×361)÷(362×548-186), =[362+548×(362-1)]÷(362×548-186), =[362-548+548×362]÷(362×548-186), =(362×548-186)÷(362×548-186), =1;
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