口算20 2 ×3.14= 0.625 2 = 2.67+6.33= 15× 7 8 + 7 8 = 3%×5%= 3
口算202×3.14=0.6252=2.67+6.33=15×78+78=3%×5%=337-(45-47)=38-12.5%=0.48×13=...
口算20 2 ×3.14= 0.625 2 = 2.67+6.33= 15× 7 8 + 7 8 = 3%×5%= 3 3 7 -( 4 5 - 4 7 )= 3 8 -12.5%= 0.48× 1 3 =
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