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整十数加、减整十数整十数加、减整十数40座座30座座704030 = ( (个个) )4个十加个十加3个十得个十得7个个十,是十,是70。43 = 74030 =704070 30 =你是怎样想的你是怎样想的?1. .50 40 = 90 40 = = = 90405090509040503 2 = 53020 =502. .5 1 = 45010 =402 3 4 = 9203040 = 909 3 2 = 8903020 = 803. .10603070604050801070303. .4080205030640601040464. .6030 = 909070 = 202040 = 606020 = 403030 = 607010 = 608050 7 =371080 6 =96307040 =605. .我拔的和你我拔的和你同样多。同样多。一共拔了多少个?一共拔了多少个? =202040(个)(个)