估算．
49×101????????????69×99????????????32×396?????????????78×20352×698???????????176×41????????????29×712?????????????195×39．
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解：估算．
49×101≈5000；?????????69×99≈7000；????????32×396≈12000；???????78×203≈16000；52×698≈35000；?????????176×41≈8000；???????????29×712≈21000；????????195×39≈8000．故