下面各题,能简算的要用简便方法计算?
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解题思路:(1)先算4.02加0.98,再用和减去3.5;
(2)从7.08里面减去0.74与1.26的和;
(3)先算小括号里面的,再算中括号里面的,最后算括号外面的;
(4)先算除法,再算加法;
(5)用乘法分配律简算;
(6)用乘法结合律简算.
(1)4.02-3.5+0.98,
=5-3.5,
=1.5;
(2)7.08-0.74-1.26,
=7.08-2,
=5.08;
(3)7.75×[20÷(3.24-3.04)],
=7.75×【20÷0.2】,
=7.75×100,
=775;
(4)4.05÷0.81+2.4,
=5+2.4,
=7.4;
(5)3.7×4.5-4.4×3.7,
=3.7×0.1,
=0.37;
(6)0.034×0.5×0.6,
=0.034×0.3,
=0.0102.
,8,下面各题,能简算的要用简便方法计算
4.02-3.5+0.98 7.08-0.74-1.26 7.75×[20÷(3.24-3.04)] 4.05÷0.81+2.4 3.7×4.5-4.4×3.7 0.034×0.5×0.6.
(2)从7.08里面减去0.74与1.26的和;
(3)先算小括号里面的,再算中括号里面的,最后算括号外面的;
(4)先算除法,再算加法;
(5)用乘法分配律简算;
(6)用乘法结合律简算.
(1)4.02-3.5+0.98,
=5-3.5,
=1.5;
(2)7.08-0.74-1.26,
=7.08-2,
=5.08;
(3)7.75×[20÷(3.24-3.04)],
=7.75×【20÷0.2】,
=7.75×100,
=775;
(4)4.05÷0.81+2.4,
=5+2.4,
=7.4;
(5)3.7×4.5-4.4×3.7,
=3.7×0.1,
=0.37;
(6)0.034×0.5×0.6,
=0.034×0.3,
=0.0102.
,8,下面各题,能简算的要用简便方法计算
4.02-3.5+0.98 7.08-0.74-1.26 7.75×[20÷(3.24-3.04)] 4.05÷0.81+2.4 3.7×4.5-4.4×3.7 0.034×0.5×0.6.
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