来自卢建昌的问题
【脱式计算(能简算的要简算)(1)4.65-1.55-1.45(2)58.1-29.7÷3(3)201×3.5-3.5(4)2.2×0.25+0.25×1.8.】
脱式计算(能简算的要简算)
(1)4.65-1.55-1.45
(2)58.1-29.7÷3(3)201×3.5-3.5(4)2.2×0.25+0.25×1.8.


【脱式计算(能简算的要简算)(1)4.65-1.55-1.45(2)58.1-29.7÷3(3)201×3.5-3.5(4)2.2×0.25+0.25×1.8.】
脱式计算(能简算的要简算)
(1)4.65-1.55-1.45
(2)58.1-29.7÷3(3)201×3.5-3.5(4)2.2×0.25+0.25×1.8.
(1)4.65-1.55-1.45,
=4.65-(1.55+1.45),
=4.65-3,
=1.65;
(2)58.1-29.7÷3,
=58.1-9.9,
=58.1-(10-0.1),
=58.1-10+0.1,
=48.2;
(3)201×3.5-3.5,
=(201-1)×3.5,
=200×3.5,
=700;
(4)2.2×0.25+0.25×1.8,
=(2.2+1.8)×0.25,
=4×0.25,
=1.