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4.8除括号,2.7乘2.4.

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6.15除括号35乘14分之3加4.8) =6.15除以12.3=0.5

2.5×括号7-4.8括号乘四 =2.5x(7-4.8)x4 =10x2.2 =22

5/6加3/8括号乘以4.8 =(40/48+18/48 )*48/10 =58/48 乘以 48/10 =58/10 =5.8

(5/6-1/8-1/12)x4.8 =(5/6-1/8-1/12)x48/10 =5/6x48/10-1/8x48/10-1/12x48/10 =4-4/5-2/5 =4-6/5 =14/5

课堂练习 计算:(1)-2.5×(-4.8)×(0.09)÷(-0.27); 2.在没有括号的不同级运算中,先算乘方再算乘除,最后算加减. 例3 计算: (1)(-3)×(...

33×0.3-4.8 =9.9-4.8 =5.1 5.1+4.8括号再除以0.3等于33

括号64减2x除6等于4.8 解: (64-2x)÷6=4.8 64-2x=28.8 2x=35.2 x=17.6

括号4.8×7.5×8等于1括号除以括号2.4×2.5×2.7括号递等式计算 括号4.8×7.5×8等于1括号除以括号2.4×2.5×2.7括号 =(4.8*7.5*8.1)÷(2.4*2.5*2.7) =(4.8÷2.4)*(7.5÷2.5)*(8.1÷2.7) =2*3*3 =18

原式=4.8÷3/4 =4.8x4/3 =6.4

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