7.2x2.5+7.5x7.2
7.2x2.5+7.5x7.2
7.2x2.5+7.5x7.2
＝7.2*（2.5+7.5）
＝7.2*10
＝72
4.7x2.8+2.5x2.8+7.2x7.2
45786
便方法计算 :4.7X2.8-2.5X2.8+7.2X7.2
4.7 X 2.8 - 2.5 X 2.8 + 7.2 X 7.2
= (4.7 - 2.5) X 2.8 + 7.2 X 7.2
= 2.2 X 2.8 + 7.2 X 7.2
= 2.2 X (10 - 7.2) + 7.2 X 7.2
= 22 - 2.2 X 7.2 + 7.2 X 7.2
= 22 + ( 7.2 - 2.2) X 7.2
= 22 + 5 X 7.2
= 22 + 36
= 58
7.2x2.5x0.5
7.2x2.5x0.5
=0.9x4x2x2.5x0.5
=0.9x(4x2.5)x(2x0.5)
=0.9x10x1
=9
7.2x7.5x6.4(0.9x1.6)
7.2x7.5x6.4÷(0.9x1.6)
=（7.2÷0.9）x7.5x（6.4÷1.6)
=0.8×7.5×4
=6×4
=24
7.2x1.25 +1.4x2.5=
7.2x1.25 +1.4x2.5
= 7.2x1.25 +2.8x1.25
= (7.2+2.8)x1.25
= 10x1.25
= 12.5
7.2x2.4十o.72x76
7.2×2.4+0.72×76
=7.2×2.4+7.2×7.6
=7.2×（2.4+7.6）
=7.2×10
=72
36X7.2+74X7.2+110X2.8
36X7.2+74X7.2+110X28
=(36+74)X7.2+110X28
=110X72+110X28
=110X(72+28)
=110*100
=11000
（7．2x7．5x5．4）除以（2．4x1．5x2．7）简便运算
（7.2x7.5x5.4）÷（2.4x1.5x2.7）
=(2.4x3x1.5x3x2.7x2)÷（2.4x1.5x2.7）
=（2.4x1.5x2.7）×（3x3x2）÷（2.4x1.5x2.7）
=3x3x2
=18
7.2x6.9+3.1x7.2=(_____+____)x_____
7.2x6.9+3.1x7.2
=(6.9+3.1)x7.2
=10×7.2
=72
