直接写出计算结果. 636﹣198= 3.6÷0.036= 7÷19= 3.7×0.1%= 6÷(﹣)= 8.1+= ×(15+)= 1﹣+=
计算下面各题(能简算的要简算)7.05×23.7+7.05×76.3 0.125×3.2×2.5 7.8-1.9+8.2-8.12.05÷0.82﹢33.6 72.8÷5.6+14.9 5.4×12.3+5.4×7.742×101-42 3.6÷1.5÷2 33.4+0.12×506.8×0.56+0.44×6.8 44×2.5×0.9 7.2÷0.5÷0.2
下列哪些是自然数,请把他们写在下边的横线上。0.8,223,0,0.001,400.1, 85.5, 6.768, 18
15x﹣0.5x=" 18a+24a=" 6.5m﹣4.7m﹣1.3m=4m×4= 20×b+b= 7c+2.5c﹣1.2c=
24.2a+a= x﹣0.4x= 1.5b+b= 5d﹣2d= .
竖式算一算。(1)32+13=(2)65-24=(3)42+5=