题目内容
脱式计算,能简算的要简算.
0.89×4.8+0.89×5.2
9.4×0.96÷(5.4÷0.9)
(8+0.8)×1.25
0.175÷0.25÷0.4.
0.89×4.8+0.89×5.2
9.4×0.96÷(5.4÷0.9)
(8+0.8)×1.25
0.175÷0.25÷0.4.
分析:(1)运用乘法的分配律进行简算;
(2)先算小括号里的除法,再算括号外的乘除法;
(3)运用乘法的分配律进行简算;
(4)运用除法的性质进行简算.
(2)先算小括号里的除法,再算括号外的乘除法;
(3)运用乘法的分配律进行简算;
(4)运用除法的性质进行简算.
解答:解:(1)0.89×4.8+0.89×5.2
=0.89×(4.8+5.2)
=0.89×10
=8.9;
(2)9.4×0.96÷(5.4÷0.9)
=9.4×0.96÷6
=9.024÷6
=1.504;
(3)(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(4)0.175÷0.25÷0.4
=0.175÷(0.25×0.4)
=0.175÷0.1
=1.75.
=0.89×(4.8+5.2)
=0.89×10
=8.9;
(2)9.4×0.96÷(5.4÷0.9)
=9.4×0.96÷6
=9.024÷6
=1.504;
(3)(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(4)0.175÷0.25÷0.4
=0.175÷(0.25×0.4)
=0.175÷0.1
=1.75.
点评:考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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