题目内容
用递等式计算(怎样简便就怎样计算).
5.4+[8×(6.34-3.59)]0.95×10.1 | 10.48+22.56÷4.7×5.4 | 4.6÷(0.23×2.5) |
分析:(1)先算小括号内的,再算中括号内的,最后算括号外的;
(2)把10.1看作10+0.1,运用乘法分配律简算;
(3)先算除法和乘法,再算加法;
(4)先算括号内的,再算括号外的.
(2)把10.1看作10+0.1,运用乘法分配律简算;
(3)先算除法和乘法,再算加法;
(4)先算括号内的,再算括号外的.
解答:解:(1)5.4+[8×(6.34-3.59)]
=5.4+[8×2.75]
=5.4+22
=27.4;
(2)0.95×10.1
=0.95×(10+0.1)
=0.95×10+0.95×0.1
=9.5+0.095
=9.595;
(3)10.48+22.56÷4.7×5.4
=10.48+4.8×5.4
=10.48+25.92
=36.4;
(4)4.6÷(0.23×2.5)
=4.6÷0.575
=8.
=5.4+[8×2.75]
=5.4+22
=27.4;
(2)0.95×10.1
=0.95×(10+0.1)
=0.95×10+0.95×0.1
=9.5+0.095
=9.595;
(3)10.48+22.56÷4.7×5.4
=10.48+4.8×5.4
=10.48+25.92
=36.4;
(4)4.6÷(0.23×2.5)
=4.6÷0.575
=8.
点评:此题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定律简便计算.
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