题目内容

【题目】0.84×1.2= 4.48÷3.2= 536÷0.4=

0.58×3.2= 7÷0.35= 8×0.25×125

0.68+1.8÷5+7.61 2.43×99+2.43 38.5×7.2+38.5×2.8.

【答案】1.008;1.4;1340;1.856;20;250;8.65;243;385

【解析】

试题分析:(1)(4)根据小数乘法竖式计算的方法求解;

(2)(3)(5)根据小数除法竖式计算的方法求解;

(6)运用乘法交换律简算;

(7)先算除法,再从左到右计算加法;

(8)(9)运用乘法分配律简算.

解:(1)0.84×1.2=1.008;

0.8 4

(2)4.48÷3.2=1.4;

(3)536÷0.4=1340;

(4)0.58×3.2=1.856;

0.5 8

(5)7÷0.35=20;

(6)8×0.25×125,

=8×125×0.25,

=1000×0.25,

=250;

(7)0.68+1.8÷5+7.61,

=0.68+0.36+7.61,

=1.04+7.61,

=8.65;

(8)2.43×99+2.43,

=2.43×(99+1),

=2.43×100,

=243;

(9)38.5×7.2+38.5×2.8,

=38.5×(7.2+2.8),

=38.5×10,

=385.

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