34.8×0.25简便计算7.43x6.5-74.3x0.55 83.4÷2.3+31.6÷2.3 49×11+49×3

34.8×0.25=4*0.25*8.7=8.7
7.43x6.5-74.3x0.55=7.43*(6.5-0.55*10)=7.43
83.4÷2.3+31.6÷2.3=(83.4+31.6)/2.3=115/2.3=50
49×11+49×36+49x54-49=49*(11+36+54-1)=49*100=4900
9999+6666x21+3333x55=3333*(3+2*21+55)=3333*100=333300

34.8×0.25=(28+6.8)×1/4=7+1.7=8.7
7.43×6.5-74.3×0.55=74.3×0.65-74.3×0.55=74.3×(0.65-0.55)
=74.3×0.1=7.43
83.4÷2.3+31.6÷2.3=(83.4+31.6)÷2.3=115÷2.3=50
49×11+49×36+49x54-49=49×(11+36+54-1）=4900
9999+6666x21+3333x55=1111×（9+6×21+3×55）=1111×(9+126+165)
=1111×300=333300

34.8×0.25=4*0.25*8.7=8.7
7.43x6.5-74.3x0.55=7.43*(6.5-0.55*10)=7.43
83.4÷2.3+31.6÷2.3=(83.4+31.6)/2.3=115/2.3=50
49×11+49×36+49x54-49=49*(11+36+54-1)=49*100=4900
9999+6666x21+3333x55=3333*(3+2*21+55)=3333*100=333300赞同7| 评论

7.43*6.5-74.3*0.55=7.43*（6.5-5.5）=7.43*1=7.43
83.4/2.3+31.6/2.3=（83.4+31.6）/2.3=115/2.3=50
49×11+49×36+49x54-49 =49*（11+36+54-1）=49*100=4900
9999+6666x21+3333x55=3333*（3+42+55）=333300