A-A+
脱式计算(能简算的要简算 写出主要步骤)①3.6-2.8+7.4-7.2 ②
问题详情
①3.6-2.8+7.4-7.2
参考答案
①3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1;
②817÷23+123×917+123
=(817+917+1)×123
=2×123
=223;
③(12+13)÷35-1718
=56÷35-1718
=2518-1718
=49;
④18÷[56+(58-13)]
=18÷[56+724]
=18÷2724
=16;
⑤3.8×0.73+0.73×6.2
=(3.8+6.2)×0.73
=10×0.73
=7.3;
⑥3.27×99+3.27
=3.27×(99+1)
=3.27×100
=327.
考点:步骤