题目内容
递等式计算(能简算的要简算) ×+6 | +3÷ | (2-×16)+ |
75%×53+47×0.75 | 24×(+-) | ÷÷. |
解:(1)×+6,
=+6,
=6;
(2)+3÷,
=+3×2,
=+6,
=6;
(3)(2-×16)+,
=(2-2)+,
=;
(4)75%×53+47×0.75,
=0.75×53+47×0.75,
=0.75×(53+47),
=0.75×100,
=75;
(5)24×(+-),
=24×+24×-24×,
=8+6-10,
=4;
(6)÷÷,
=××,
=.
分析:(1)先算乘法,再算加法;
(2)先算出发,再算加法;
(3)先算括号内的乘法,再算括号内的减法,最后算加法;
(4)把75%化为小数,运用乘法分配律简算;
(5)运用乘法分配律简算;
(6)把除法改为乘法,约分计算.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
=+6,
=6;
(2)+3÷,
=+3×2,
=+6,
=6;
(3)(2-×16)+,
=(2-2)+,
=;
(4)75%×53+47×0.75,
=0.75×53+47×0.75,
=0.75×(53+47),
=0.75×100,
=75;
(5)24×(+-),
=24×+24×-24×,
=8+6-10,
=4;
(6)÷÷,
=××,
=.
分析:(1)先算乘法,再算加法;
(2)先算出发,再算加法;
(3)先算括号内的乘法,再算括号内的减法,最后算加法;
(4)把75%化为小数,运用乘法分配律简算;
(5)运用乘法分配律简算;
(6)把除法改为乘法,约分计算.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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