把如图得数相同的算式连起来.
简便计算0.389×4×0.25 10.1×7.8 6.37×3.02+6.98×6.37.
×15+÷.
简便计算.①7.7×7+7.7×2+7.7 ②87.3×45+10.7×45+2×45 ③(2.5+2.5+2.5+2.5)×2.5×8.
43.87×2.65﹣26.5×5.613=( 265 )
用简便方法计算.15.3+0.86+0.14+4.7 147×8+8×53 6900÷25÷4 25.3﹣8.1﹣10.9.