题目内容
计算下列各题.
6.8+6.8×6.8-1.5×6.8;
(3.6+12.03÷0.3 )×2.5;
1.25×0.25×8×0.4;
96.356×(5.9+5.1-10).
6.8+6.8×6.8-1.5×6.8;
(3.6+12.03÷0.3 )×2.5;
1.25×0.25×8×0.4;
96.356×(5.9+5.1-10).
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)运用乘法分配律简算;
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外乘法;
(3)运用乘法交换律和结合律简算;
(4)先算小括号里面的加法,再算小括号里面的减法,最后算括号外的乘法.
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外乘法;
(3)运用乘法交换律和结合律简算;
(4)先算小括号里面的加法,再算小括号里面的减法,最后算括号外的乘法.
解答:
解:(1)6.8+6.8×6.8-1.5×6.8
=6.8×(1+6.8-1.5)
=6.8×6.3
=42.84;
(2)(3.6+12.03÷0.3 )×2.5
=(3.6+40.1)×2.5
=43.7×2.5
=109.25;
(3)1.25×0.25×8×0.4
=(1.25×8)×(0.25×0.4)
=10×0.1
=1;
(4)96.356×(5.9+5.1-10)
=96.356×1
=96.356.
=6.8×(1+6.8-1.5)
=6.8×6.3
=42.84;
(2)(3.6+12.03÷0.3 )×2.5
=(3.6+40.1)×2.5
=43.7×2.5
=109.25;
(3)1.25×0.25×8×0.4
=(1.25×8)×(0.25×0.4)
=10×0.1
=1;
(4)96.356×(5.9+5.1-10)
=96.356×1
=96.356.
点评:本题考查了四则混合运算,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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