口算.340×6=530×9=5×270=650×3=7×120=3×250=850×2=740×6=8×380=560×5=
(1)8×39×125(2)78+143+122+157(3)3600﹣128÷8×25(4)95×23+6×23﹣23(5)986÷34×62﹣1200(6)984÷[(457﹣273)÷23].
45×102.
用简便方法计算下面各题:25+96+35+4; 4×13×25×5; 25×32×15;918﹣233﹣167﹣518;38×14+162×14; 7000÷25÷4.
用简便方法计算(1)0.13×+×13%(2)18×25%+68×25%+14÷4.
用简便方法计算8.16+5.49+2.84+4.51 1.29+3.7+2.71+6.312.98﹣(6.37+3.98)36.9﹣10.47+3.1﹣10.53.