题目内容
【题目】计算下面各题(能简算的要简算)
(0.75﹣)×(+) 1.25×0.94×0.8 ÷(3﹣﹣)
8.2×99+8.2 4.35×99×2+8.7 +×(﹣)
【答案】①(0.75﹣)×(+)
=()×
=
=;
②1.25×0.94×0.8
=0.94×(1.25×0.8)
=0.94×1
=0.94;
③÷(3﹣﹣)
=÷[3﹣()]
=÷[3﹣1]
=÷2
=
=;
④8.2×99+8.2
=8.2×(99+1)
=8.2×100
=820;
⑤4.35×99×2+8.7
=4.35×2×99+8.7
=8.7×99+8.7
=8.7×(99+1)
=8.7×100
=870;
⑥+×(﹣)
=+×
=
=.
【解析】
试题分析:①(0.75﹣)×(+),先算括号里面的减法、加法,再算乘法;
②1.25×0.94×0.8,运用乘法交换律和结合律简算;
③÷(3﹣﹣),运用减法的运算性质简算;
④8.2×99+8.2,运用乘法分配律简算;
⑤4.35×99×2+8.7,首先运用乘法交换律、结合律,再运用乘法分配律简算;
⑥+×(﹣),先算括号里面的减法,再算乘法,最后算加法;
解:①(0.75﹣)×(+)
=()×
=
=;
②1.25×0.94×0.8
=0.94×(1.25×0.8)
=0.94×1
=0.94;
③÷(3﹣﹣)
=÷[3﹣()]
=÷[3﹣1]
=÷2
=
=;
④8.2×99+8.2
=8.2×(99+1)
=8.2×100
=820;
⑤4.35×99×2+8.7
=4.35×2×99+8.7
=8.7×99+8.7
=8.7×(99+1)
=8.7×100
=870;
⑥+×(﹣)
=+×
=
=.
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