题目内容

1.递等式计算,能简算的要简算:
(14.4-14.4÷120)÷0.2       0.25×(40+4)6.8×3.7+3.7×3.2
307×10.1           9.2÷0.4-9.2×0.4        8.3×2.7-2.7+2.7×2.7

分析 (1)先算小括号里面的除法和减法,再算计算括号外面的除法;
(2)(3)(4)(6)根据乘法分配律计算即可求解;
(5)先算乘除法,再算减法.

解答 解:(1)(14.4-14.4÷120)÷0.2
=(14.4-0.12)÷0.2
=14.28÷0.2
=71.4
(2)0.25×(40+4)
=0.25×40+0.25×4
=10+1
=11
(3)6.8×3.7+3.7×3.2
=(6.8+3.2)×3.7
=10×3.7
=37
(4)307×10.1
=307×(10+0.1)
=307×10+307×0.1
=3070+30.7
=3100.7
(5)9.2÷0.4-9.2×0.4
=23-3.68
=19.32
(6)8.3×2.7-2.7+2.7×2.7
=(8.3-1+2.7)×2.7
=10×2.7
=27

点评 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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