a). {3/8*(-1/4)}+(3/8*3/4)
b) {7/9*1/4} - {7/9*(-3/4)}
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Step-by-step explanation:
a {3/8×-1/4}+(3/8×3/4)
= -3/32+9/32
= -3+9/32
= 6/32
= 3/16
b {7/9*1/4} - {7/9*(-3/4)}
= 7/36-(-21/36)
= 7+21/36
= 28/36
= 7/9
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