292 + (89 + 192)
= (292 + 8 – 8) + 89 + (192 + 8 – 8)
= (300 – 8) + 89 + (200 – 8)
= 500 + (89 – 16)
= 500 + 73
= 573
方法2:自力更生
292 + 89 + 192
= 292 + 8 +81 + 192
= 292 + 8 +73 + 8 + 192
= (292 + 8) +73 +(8 + 192)
= 300 + 73 + 200
= 573
292 + (89 + 192)
= (292 + 8 – 8) + 89 + (192 + 8 – 8)
= (300 – 8) + 89 + (200 – 8)
= 500 + (89 – 16)
= 500 + 73
= 573
方法2:自力更生
292 + 89 + 192
= 292 + 8 +81 + 192
= 292 + 8 +73 + 8 + 192
= (292 + 8) +73 +(8 + 192)
= 300 + 73 + 200
= 573
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