How to simplify the operation of 0.62 * 1.8 + 3.2 * 0.18 + 6 * 0.018

How to simplify the operation of 0.62 * 1.8 + 3.2 * 0.18 + 6 * 0.018


62*0.018+32*0.018+6*0.018
=（62+32+6）*0.018
=100*0.018
=1.8



Take off formula calculation (if it can be calculated simply, write out the main steps) ① 3.6-2.8 + 7.4-7.2 ② 817 △ 23 + 123 × 917 + 123 ③ (12 + 13) △ 35-1718 ④ 18 △ 56 + (58-13)]


①3.6-2.8+7.4-7.2　=3.6+7.4-（2.8+7.2）=11-10=1；②817÷23+123×917+123=817×123+123×917+123×1=（817+917+1）×123=2×123=223；③（12+13）÷35-1718=56÷35-1718=2518-1718=49；④18÷[56+（58-13）]=18÷...

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