题目内容

4.计算(能简算的要用简算).
0.28÷3.5×0.6       5.46+4.48÷0.28         1.25÷0.25÷4
63×10.1             2.05÷0.82+33.6         9.07-22.78÷3.4

分析 (1)从左往右依次计算;
(2)先算除法,再算加法;
(3)运用除法的性质简算;
(4)把10.1看作10+0.1,运用乘法分配律简算;
(5)先算除法,再算加法;
(6)先算除法,再算减法.

解答 解:(1)0.28÷3.5×0.6 
=0.08×0.6
=0.048

(2)5.46+4.48÷0.28 
=5.46+16
=21.46

(3)1.25÷0.25÷4
=1.25÷(0.25×4)
=1.25÷1
=1.25

(4)63×10.1
=63×(10+0.1)
=63×10+63×0.1
=630+6.3
=636.3

(5)2.05÷0.82+33.6
=2.5+33.6
=36.1

(6)9.07-22.78÷3.4
=9.07-6.7
=2.37

点评 此题考查了运算定律与简便运算,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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