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$第2课时长方体和正方体的认识(二) .(6+4+3)×4=13×4=52(厘米)2.60÷12 =5(厘米)3.96÷12=8(厘米)8×8=64(平方 厘米)4.(5+4+3)×4=12×4=48(分米) 48÷12=4(分米)5.(15+15+8)×4+18=38× 4+18=152+18=170(厘米)6.8×12÷4-10 7=96÷4-10-7=24-10-7=14-7=7(厘米) 7.50厘米=0.5米80厘米=0.8米(2.5+0.5 +0.8)×4=3.8×4=15.2(米)8.(100+48)×2 +15×4=148×2+15×4=296+60=356(米)