递等式计算 8.7×3.5-2.2×3.5+6.5×6.5
5个回答
8.7×3.5-2.2×3.5+6.5×6.5
=(8.7-2.2)×3.5+6.5×6.5
=6.5×3.5+6.5×6.5
=6.5×(3.5+6.5)
=6.5×10
=65
相关问题
递等式计算:2.6+7.5×0.5+7.4
计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
若2!=2×3,3!=3×4×5,5!=5×6×7×8×9.按此规则计算[4!/6!].
如何计算下题: 1×2×3+2×3×4+3×4×5+4×5×6+5×6×7+6×7×8+7×8×9+……+n×(n+1)
递等式计算,怎样简便就怎样算.[5/6]×[3/20]÷[5/18] [4/5]×3.5+5.5×80%+0.8
递等式计算(能简便的要简便) ①( 3 8 + 5 6 )÷ 1 24 ②2.5×13×0.42 ③5.3×12-33.