用竖式计算.(1)1.1019×1.2=(2)4.2×5.15=(3)0.93×21=(4)4.026÷13.2=(5)0.87÷0.29=(6)1.089÷72.6=
简算.×3+×5+×10 999×7+111×7(+++)×2002.
简算 ①9﹣(3+0.4) ②1.8×+2.2×25% ③×[0.75﹣(﹣)].
.
=
1990×2.8+199×51+1.99×2100.