商是几十多?用线连一连.8□÷3 7□÷2 9□÷4
计算下面各题,怎样简便就怎样算.×0.25+0.375× 4.97+6.38+5.03﹣4.385.84×1.36+13.6×0.316+1.36 ﹣÷×0.5.
下面各题怎样简便就怎样算.3.7×99+3.7 +﹣ 5.37﹣1.47﹣2.53105×(+) 13+45÷9 ×+×.
9999×7778+3333×6666.
下列各题怎样简便就怎样算(1)7.8×36+78×6.4 (2)74×14+111×24.
简便计算84÷63×3 2.1×5.3+2.1×6.2﹣2.1×1.5.