简便计算
72x125
64x99+64
8.29+3.7+0.71+6.3
4900÷25÷4
17×43-43×7
54.3-12.19+25.7-17.81
(写算式，我釆纳)
72x125
=9x8x125
=9x(8x125)
=9x1000
=9000
64x99+64
=64x(99+1)
=64x100
=6400
8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19
4900÷25÷4
=4900÷(25x4)
=4900÷100
=49
17×43-43×7
=43×(17-7)
=43×10
=430
54.3-12.19+25.7-17.81
=(54.3+25.7)-(12.19+17.81)
=80-30
=50
=9x8x125
=9x(8x125)
=9x1000
=9000
64x99+64
=64x(99+1)
=64x100
=6400
8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19
4900÷25÷4
=4900÷(25x4)
=4900÷100
=49
17×43-43×7
=43×(17-7)
=43×10
=430
54.3-12.19+25.7-17.81
=(54.3+25.7)-(12.19+17.81)
=80-30
=50
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第1个回答 2016-06-22
2100÷42=2100÷7÷6=300÷6=50
25x64x125=(25x4)x2x(8x125)=100x2x1000=200000
25x64x125=(25x4)x2x(8x125)=100x2x1000=200000
第2个回答 2016-06-22
不告诉你。
第3个回答 2016-06-22
追答
